Safety devices, individual battery cells, battery modules, and methods for manufacturing individual battery cells

Abstract

The present invention relates to a safety device (10) for use in a single-cell wall (5) between the inner space (3) and the outer side (4) of a single-cell battery (2), having a valve body (11) having a gas guiding path (20) for guiding gas from the inner space (3) to the outer side (4) of the single-cell battery to ventilate the inner space (3). The present invention also relates to a single-cell battery (2), a battery module (1), and a method for manufacturing a single-cell battery (2).

Description

Technical Field

[0001] The present invention relates to a safety device for arrangement in a single cell wall, a battery cell (or battery unit) having a safety device, a battery module, and a method for manufacturing a battery cell. Background Technology

[0002] It is known that battery modules and battery systems, especially in hybrid or electric vehicles, typically face high safety requirements. In these applications, safety devices must function reproducibly to prevent malfunctions.

[0003] For example, gas may be generated in a single cell under different conditions. Typically, during aging, a reaction may occur between the electrolyte and active materials, leading to gas formation. As gas continues to form, the pressure in the single cell increases, which may cause the single cell to open and potentially cause various types of damage to the battery system. It is advantageous for the design of battery systems in terms of so-called "thermal propagation" and "thermal runaway" to know where potential single-cell opening occurs so that it can be addressed and / or the battery system designed accordingly.

[0004] Therefore, a single battery cell is known, for example, from patent document DE 10 2013 221 760 A1, which includes a vent valve and a separate rupture valve. This rupture valve constitutes a rated fracture point. However, the single battery cell is thus mechanically weakened at least in two locations by these different components. Furthermore, these two components lead to complex assembly of the single battery cell. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to at least partially eliminate the disadvantages known from the prior art. In particular, the technical problem to be solved by the present invention is to provide an improved safety device for a single battery cell, by which the functionality and / or safety of the single battery cell and / or battery module are improved in a simple manner.

[0006] The aforementioned technical problems are solved by the safety device according to the invention, the battery cell according to the invention, the battery module according to the invention, and the manufacturing method according to the invention. Other features and details of the invention are derived from the specification and drawings. Herein, the features and details described with respect to the safety device according to the invention also apply to the battery cell according to the invention, the battery module according to the invention, and / or the manufacturing method according to the invention, and vice versa; therefore, for the purposes of this disclosure, each individual aspect of the invention is always referred to or may be referred to in relation to the other.

[0007] According to a first aspect of the invention, a safety device is provided for arrangement in a single-cell wall between the internal space of a single-cell battery and the external space of the single-cell battery. The safety device has a valve body having a gas guide path for guiding gas from the internal space of the single-cell battery to the external space of the single-cell battery for ventilation of the internal space. Furthermore, the safety device includes an emergency opening element, preferably used to locally and / or mechanically weaken the single-cell wall to urgently open the internal space of the single-cell battery according to the gas pressure in the gas guide path. The valve body and the emergency opening element here form a common structural unit for common arrangement within the single-cell wall.

[0008] The battery cell is preferably designed for use in vehicle batteries. In particular, the battery cell can be designed as a lithium-ion cell. The cell wall is preferably part of the cell housing that surrounds the internal space of the cell. Gases may be generated in the internal space of the cell during operation, leading to overpressure within the internal space.

[0009] The arrangement of the safety device in the single pool wall can be understood in particular as the safety device being able to be arranged at least partially between two wall sections of the single pool wall. Preferably, the safety device can penetrate the single pool wall and / or form a transition between the interior space of the single pool and the exterior of the single pool.

[0010] It is feasible to form, or be able to form, at least one or more channels between the internal space of the single pool and the external space of the single pool via the gas guide path. Depending on the overpressure, ventilation can be performed on the internal space of the single pool via the gas guide path. Here, the gas guide path can be closed or at least partially opened relative to the external space of the single pool before ventilation. For example, it can be specified that the gas guide path is completely closed under normal conditions and can be temporarily opened, especially for ventilation. It is conceivable that the gas guide path includes a labyrinthine sealing device, by which gas flow is prevented, especially within a predetermined pressure range, from passing through the gas guide path. The gas guide path can be designed to be rotationally symmetric and / or intermittent. The valve body preferably surrounds the gas guide path. As a supplement or alternative, it can be specified that the gas guide path is closed by a cover element before ventilation, the cover element being connected to the valve body and / or the single pool wall, especially hinged to the valve body and / or the single pool wall.

[0011] The valve body and the emergency opening element are particularly interconnected to form a structural unit. For example, the emergency opening element may be fixed to the valve body. Preferably, the valve body and the emergency opening element are integrally formed and / or constructed of the same material. For example, the emergency opening element may be molded onto the valve body.

[0012] Because the valve body and emergency opening element are integrated into the structural unit in the safety device according to the invention, so that they are arranged together in the single-cell wall, a simple assembly of the safety device in the single-cell wall is formed. Therefore, the single-cell wall can be partially interrupted only in one area to accommodate the safety device. Thus, a multifunctional safety device can be provided, which enables ventilation via a gas guide path throughout the lifespan of the single-cell battery. Simultaneously, by locally weakening the single-cell wall with the emergency opening element, a rated fracture point can be provided in emergency situations, such as thermal runaway or impending thermal runaway. This allows for a sudden gas expansion, thereby reducing the gas pressure within the single-cell internal space. Due to the predictable direction, the battery module can be accordingly designed to guide gas outwards and preferably maintain the function of adjacent single-cell batteries.

[0013] Furthermore, in the safety device according to the invention, it is conceivable that the gas guiding path has at least one first gas space for collecting (or accumulating) gas within the gas guiding path, wherein the first gas space is arranged between at least two narrow portions of the gas guiding path. The first gas space preferably comprises a cavity that forms part of the gas guiding path. Thus, an additional pressure chamber can be provided in the gas guiding path through the first gas space to regulate and / or control the gas flow within the gas guiding path. Particularly feasible through the first gas space is the ability to regulate an ultimate pressure at which ventilation from the interior space of the single pool to the exterior space of the single pool can be achieved. Therefore, it can be stipulated that gas first accumulates in the first gas space before being discharged to the exterior space of the single pool. Furthermore, feasible through the first gas space is the ability to prevent or reduce the entry of moisture, for example in the form of condensate and / or air, and / or the diffusion of gas from the exterior space of the single pool to the interior space of the single pool.

[0014] Within the scope of the invention, it is also conceivable that the gas guiding path has at least one second gas space for collecting gas within the gas guiding path, wherein the second gas space is arranged between at least two additional narrow sections of the gas guiding path and is preferably hydraulically connected in series with the first gas space. The first and / or second gas spaces can advantageously be designed as spherical in order to achieve, for example, uniform gas pressure along multiple, especially all, directions. The series connection of the first and second gas spaces can advantageously form a stepped pressure barrier. In particular, the second gas space can provide an additional safety level relative to the first gas space, through which moisture can be prevented from entering the internal space of the single pool.

[0015] Furthermore, in the safety device according to the invention, it can be advantageously provided that the valve body is made of an elastic material, due to which the first gas space, the second gas space, and / or the gas guiding path can expand according to the gas pressure, preferably along at least one widening direction perpendicular to the gas guiding path. The elastic material can be understood in particular as a flexible, elastically deformable material. Preferably, the valve body can comprise plastic, especially plastic based on an elastomer and / or polymer matrix. Therefore, the valve body can be, in particular, expandable and / or inflatable. Due to the expandability of the valve body, the valve body can have advantageous strength relative to the pressure in the gas guiding path, thereby avoiding violent breakage. Furthermore, it is thus possible for an emergency opening element to be pressed into the single-cell wall to facilitate emergency opening of the single-cell internal space. Advantageously, the valve body can also be electrolyte-resistant and / or weldable. Due to the electrolyte-resistant design, contact between the valve body and the electrolyte in the single-cell internal space is harmless, thus eliminating the need for additional sealing devices. Improved fixation in the single-cell wall can be achieved through weldability.

[0016] Preferably, in the safety device according to the invention, the emergency opening element may have at least one edge extending on the valve exterior of the valve body to penetrate into the single-cell wall. The edge may be designed to surround the valve body. With this edge, a notch effect can be introduced or is possible to be introduced into the single-cell wall. Particularly feasible is that, when the valve body expands particularly elastically, the edge can be pressed into the single-cell wall to weaken and / or damage the single-cell wall. The edge may be formed at an acute angle to enable the notch effect and / or reduce and / or adjust the mechanical resistance when pressing the edge into the single-cell wall. When the battery single cell is, for example, a pouch-type single cell, the edge may be designed to trigger a peeling process of the single-cell wall. Thus, multiple layers of the battery single cell can be sequentially detached from each other to achieve emergency opening.

[0017] Furthermore, in the safety device according to the invention, it is conceivable that the edge is part of the zahnprofil of the emergency opening element, which is arranged on the outer side of the valve body. This zahnprofil may extend at least segmentally or entirely on the outer side of the valve body, particularly the outer periphery, and / or the zahnprofil may be designed to surround the valve body. Here, the zahnprofil may advantageously be integrally constructed with the valve body, preferably milled, turned, or shaped on the valve body. Multiple edges can be formed by the zahnprofil, which can damage the single-pool wall to facilitate emergency opening. In particular, the multiple edges can facilitate the peeling process of multiple wall layers. Furthermore, when the valve body expands due to overpressure in the gas guide path, at least one edge formed by the zahnprofil can be pressed linearly into the single-pool wall by the zahnprofil to achieve a notch effect.

[0018] Preferably, in the safety device according to the invention, the gas guiding path may be specified to have at least two surface regions that are in contact with each other in a normal state and spaced apart from each other in a ventilated state. The surface regions may be specified to have microstructures to increase surface stress when the surface regions are in contact with each other. These surface regions may include opposing regions having semi-circular or straight cross-sectional profiles. For example, the valve body may include two opposing sub-regions whose surfaces facing each other form the surface regions. The gas guiding path can be closed by the contact of the surface regions in a normal state, thereby preventing or reducing gas flow between the internal space of the single pool and the outside of the single pool. The gas guiding path can be opened due to increased pressure in the internal space of the single pool to enable ventilation and / or emergency opening of the internal space of the single pool.

[0019] Furthermore, in the safety device according to the invention, the valve body may have a fixing interface for a materially bonded connection to the single pool wall, and / or the valve body may be welded to the single pool wall. This fixing can be highly automated through a materially bonded, particularly weldable, connection between the valve body and the single pool wall. Simultaneously, this fixing is preferably feasible in achieving a seal between the valve body and the single pool wall. For example, the valve body can be welded circumferentially to the single pool wall for this purpose. Alternatively, the fixing interface may be designed for spot welding the valve body to the single pool wall. The fixing interface may be advantageously designed to withstand breakage during emergency opening of the internal space of the single pool.

[0020] Within the scope of this invention, it is also conceivable that the valve body is designed for integration into a bag-type single pool by being arranged between two single-pool membranes. The bag-type single pool may, for example, include at least one membrane for forming the single-pool wall. Preferably, the bag-type single pool includes multiple layers of membranes for forming the single-pool wall. Here, edges and / or teeth for emergency opening can be pressed between these membrane layers to enhance the notch effect and cause the single-pool wall to tear or trigger a peeling process. During the assembly of the bag-type single pool, the valve body can be secured to the membrane layers, preferably between two membrane layers.

[0021] According to another aspect of the invention, a single battery cell for a battery module is provided. The single battery cell has an internal space and a single cell wall. A safety device according to the invention is arranged in the single cell wall between the internal space and the external side of the single cell.

[0022] Therefore, the advantages of the battery cell according to the invention are the same as those already described in detail with reference to the safety device according to the invention. Preferably, the battery cell is a pouch-type cell. However, it is also conceivable that the battery cell may be other different cell types, such as a cylindrical battery cell.

[0023] According to another aspect of the invention, a battery module is provided. The battery module has at least one battery cell according to the invention. The battery module also has a drainage system for venting gas from the battery cell, preferably from a safety device of the battery cell, to the outside of the battery module.

[0024] Therefore, the advantages of the battery module according to the invention are the same as those already described in detail with reference to the safety device and / or the battery cell according to the invention. In particular, the battery module has multiple battery cells, preferably identical in structure. Each battery cell can be oriented (or aligned with) the safety device preferably toward the exhaust system so that, in the event of ventilation and / or emergency opening of the internal space of the battery cell, gas from the internal space of the battery cell can be exhausted to the outside of the module via the exhaust system. Therefore, ventilation and / or emergency opening via the safety device can be aligned with the exhaust system. This reduces the impact of exhaust from the internal space of the battery cell on adjacent battery cells. In particular, thanks to the exhaust system and the safety device, even if one of the battery cells is ventilated and / or opened in an emergency, adjacent battery cells can continue to operate.

[0025] According to another aspect of the invention, a method for manufacturing a battery cell, preferably according to the invention, is provided. Here, the battery cell has a single cell wall. The manufacturing method specifically comprises, in the form of method steps:

[0026] -Provide a safety device according to the invention,

[0027] - Assemble the battery cell, wherein a safety device is arranged in the cell wall between the cell's internal space and the cell's external surface.

[0028] Therefore, the advantages of the manufacturing method according to the invention are the same as those already described in detail with reference to the safety device according to the invention, the battery cell according to the invention, and / or the battery module according to the invention. To provide the safety device, it can be manufactured, especially completely manufactured. The assembly of the battery cell can preferably be at least partially or fully automated. It can be specified that two or more single-cell membranes for manufacturing the single-cell wall are provided before the safety device is arranged in the single-cell wall. Preferably, during the arrangement of the safety device in the single-cell wall, the internal space of the single cell and / or the single-cell wall is sealed by the safety device. For example, the safety device can be welded into the single-cell wall, preferably between the single-cell membranes, and / or welded from the internal space of the single cell towards the outside of the single cell. Especially when the battery cell is a pouch-type single cell, this allows for low-cost mass production of battery cells with safety devices. The manufacturing method can also provide a method for manufacturing a battery module according to the invention. In this case, multiple battery cells can be installed together with a discharge system. Attached Figure Description

[0029] Other advantages, features, and details of the invention will become apparent from the following description, in which embodiments of the invention are described in detail with reference to the accompanying drawings. Here, the features mentioned in the specification may be important to the invention individually or in any combination. Schematic illustration in the drawings:

[0030] Figure 1 A first embodiment of a single battery cell according to the invention is shown for use in a battery module according to the invention, the single battery cell having a safety device according to the invention;

[0031] Figure 2 and Figure 3 The battery module is shown in perspective and cross-sectional view.

[0032] Figure 4 A partial cross-sectional view of a single battery cell with safety devices is shown;

[0033] Figure 5 The safety device is shown in its assembled state; and

[0034] Figure 6 Another embodiment of a single battery cell for a battery module according to the invention is shown, which has a safety device according to the invention.

[0035] In the following description of some embodiments of the invention, the same reference numerals are used for the same technical features even in different embodiments. Detailed Implementation

[0036] Figure 1 A battery cell 2 according to the invention is shown, which has at least one safety device 10 according to the invention. Figure 2 and Figure 3 A battery module 1 according to the invention is shown, which has a single battery cell 2 equipped with a safety device 10. The single battery cell 2 and / or the battery module 1 can be designed for arrangement in a vehicle battery, particularly in the form of a traction battery for a vehicle. Furthermore, the battery module 1 includes a gas discharge system 6 for discharging gas from the safety device 10 to the outside of the battery module 1. Here, the safety device 10 is preferably oriented such that gas generated in the single battery cell 2 and escaping from the single battery cell 2 in the area of ​​the safety device 10 is aligned with the gas discharge system 6 so as to be guided to the outside of the module. Particularly when the battery module 1 is designed for arrangement in a vehicle battery, the safety device 10 can be arranged on the underside of the battery module 1 so as to guide gas toward the base plate in the assembled state of the battery module 1 in the vehicle.

[0037] According to Figure 1 In one embodiment, the battery cell 2 has two safety devices 10 arranged on opposite sides of the battery cell 2. It is conceivable that the battery cell 2 has multiple, particularly identical, safety devices 10. One of these safety devices 10 is discussed below.

[0038] like Figure 4 As shown, the safety device 10 is arranged, in particular, in the single-cell wall 5 between the single-cell interior space 3 and the single-cell exterior 4 of the single-cell 2 according to the manufacturing method of the present invention for manufacturing a single-cell battery 2. Preferably, the single-cell battery 2 can be designed as a pouch-type single-cell battery. In this case, the safety device 10 can be advantageously arranged, particularly during the assembly process of the single-cell battery 2, between the two single-cell membranes 2.1 of the single-cell battery 2.

[0039] As shown in the detailed view of the safety device 10 Figure 5 As shown, the safety device 10 has a valve body 11 with a gas guide path 20 for guiding gas from the interior space 3 of the single pool to the exterior space 4 of the single pool for ventilation of the interior space 3. The gas guide path 20 preferably includes a path inlet 25 oriented toward the interior space 3 and a path outlet 26 oriented toward the exterior space 4 of the single pool. Preferably, the gas guide path 20 includes at least two surface regions 20.1 that are in contact with each other in the normal state and spaced apart from each other in the ventilated state. For example, the path inlet 25 of the gas guide path 20 may have a partially circular and / or spherical profile that opens toward the interior space 3 of the single pool. Thus, the surface regions 20.1 can be squeezed apart in the event of overpressure in the interior space 3 of the single pool to open the gas guide path 20. Advantageously, the valve body 11 may have a fixing interface 13 for materially engaging with the single pool wall 5. For example, the valve body 11 may be welded to the single pool wall 5, particularly in a circumferential manner. The valve body 11 may surround the gas guide path 20, particularly in a circumferential and / or rotationally symmetrical manner. However, it is also conceivable that the valve body 11 may be designed as a multi-piece structure, particularly mirror-symmetrically. In this case, the gas guide path 20 may be formed, for example, by a separating plane between two parts of the valve body 11.

[0040] Furthermore, the gas guiding path 20 has at least one first gas space 21 for collecting gas within the gas guiding path 20. The first gas space 21 is arranged between at least two narrow sections 23 of the gas guiding path 20. Additionally, a second gas space 22 of the gas guiding path 20 is hydraulically connected in series with the first gas space 21 and is used for collecting gas within the gas guiding path 20. For this purpose, the second gas space 22 is arranged between at least two additional narrow sections 23 of the gas guiding path 20. The first and second gas spaces 21 and 22 prevent the entry of moisture, such as condensate and / or air, and / or the diffusion of gas from the outer side 4 of the single pool into the inner space 3 of the single pool. For example, in the event of overpressure in the inner space 3 of the single pool, the pressure in the first gas space 21 may rise first, thus the pressure in the second gas space 22 is applied with a delay. Liquid entry from the outside is prevented by the pressure in the first gas space 21 and / or the second gas space 22. Furthermore, by connecting the first gas space 21 and the second gas space 22 in series, liquid ingress can be prevented even when there is no pressure difference or a small pressure difference between the inner space 3 and the outer space 4 of the single pool. Therefore, the second gas space 22 and the first gas space 21, due to their series connection, form a continuous pressure barrier.

[0041] Furthermore, the safety device 10 has an emergency opening element 30 for weakening the single-pool wall 5, so as to urgently open the internal space 3 of the single pool according to the gas pressure in the gas guide path 20. In particular, it can be specified that the gas pressure used to trigger the emergency opening is less than or equal to 7 bar. The valve body 11 and the emergency opening element 30 are here formed as a structural unit so as to be arranged together in the single-pool wall 5. The emergency opening element 30 includes at least one edge 31 that extends on the valve outer side 12 of the valve body 11 so as to extend into the single-pool wall 5. Here, the edge 31 is part of the tooth profile 32 of the emergency opening element 30, which is arranged on the valve outer side 12 of the valve body 11 and has a plurality of edges 31 of the same type. The tooth profile 32 is preferably integrally constructed with the valve body 11. For example, the valve body 11 can be constructed together with the tooth profile 32 as a casting and / or a composite casting.

[0042] The valve body 11 is made of an elastic material, which allows the first gas space 21, the second gas space 22, and / or the gas guiding path 20 to expand along a widening direction 24 perpendicular to the gas guiding path 20, depending on the gas pressure. Preferably, the material of the valve body 11 is compatible with the medium and / or resistant to electrolytes. For example, the valve body 11 may be at least partially or entirely made of an elastomer. In particular, the valve body 11 can expand in a balloon-like manner depending on the gas pressure. Therefore, when the gas pressure in the gas guiding path 20, especially the first gas space 21 and / or the second gas space 22, increases, the edges 31 of the tooth profile 32 are pressed into the single-cell wall 5 along the widening direction 24. This forms multiple regions with an enhanced notch effect, allowing the single-cell wall 5 to partially tear and / or detach from the valve body 11. When the battery single cell 2 is a pouch-type single cell, a peeling process can be triggered, in which the membrane layers of the single-cell wall 5 are sequentially detached. In particular, when the volume of the valve body 11 increases, the fixed interface 13 can also be damaged.

[0043] Therefore, the single-cell wall 5 is only partially interrupted by the safety device 10 in one area. A multi-functional safety device 10 is also provided, which enables ventilation via the gas guide path 20 throughout the lifespan of the single-cell battery 2. Simultaneously, because the single-cell wall 5 is locally weakened by the emergency opening element 30, a rated fracture point can be provided in emergency situations, such as thermal runaway or impending thermal runaway. This allows for a sudden expansion of gas into the exhaust system 6 of the battery module 1, thereby reducing the gas pressure in the internal space 3 of the single-cell battery. Due to the predictable direction, the gas can be advantageously guided outwards and / or the functionality of adjacent single-cell batteries 2 can be maintained.

[0044] Figure 6 Another embodiment of the battery cell 2 is shown, which has at least two safety devices 10 according to the invention. Here, these safety devices 10 are arranged on diagonally opposite sides of the battery cell 2. Thus, the battery cell 2 can be advantageously disassembled from both sides toward the middle and / or open different gas paths.

[0045] The above description of the embodiments is merely an example to illustrate the invention. Of course, the individual features of these embodiments can be freely combined with each other as long as they are technically meaningful and do not depart from the scope of the invention.

[0046] List of reference numerals

[0047] 1 Battery Module

[0048] 2-cell single battery

[0049] 2.1 Single-cell membrane

[0050] 3 Single pool internal space

[0051] 4 Single pool outer side

[0052] 5 Single pool wall

[0053] 6-row guide system

[0054] 10 safety devices

[0055] 11 Valve body

[0056] 12 valve outer side

[0057] 13 Fixed Interfaces

[0058] 20 Gas Guidance Path

[0059] 20.1 surface area

[0060] 21 First Gas Space

[0061] 22 Second Gas Space

[0062] 23 Narrow sections

[0063] 24. Expanding Directions

[0064] 25 Path Entry

[0065] 26 Path Exit

[0066] 30 Emergency Opening Items

[0067] 31 edges

[0068] 32-tooth profile

Claims

1. A safety device (10) for arrangement in a single cell wall (5) between the inner space (3) and the outer side (4) of a single cell (2), having A valve body (11) having a gas guide path (20) for guiding gas from the internal space (3) of the single pool to the outside (4) of the single pool for ventilation of the internal space (3); and An emergency opening device (30) is provided to weaken the single-pool wall (5) to urgently open the internal space (3) of the single pool according to the gas pressure in the gas guide path (20). in, The valve body (11) and the emergency opening element (30) form a structural unit so that they can be arranged together in a single pool wall (5). The valve body (11) is made of an elastic material, which allows the gas guide path (20) to expand along at least one widening direction (24) perpendicular to the gas guide path (20) according to the gas pressure.

2. The safety device (10) according to claim 1, Its features are, The gas guiding path (20) has at least one first gas space (21) for collecting gas within the gas guiding path (20), wherein the first gas space (21) is arranged between at least two narrow portions (23) of the gas guiding path (20).

3. The safety device (10) according to claim 1 or 2, Its features are, The gas guiding path (20) has at least one second gas space (22) for collecting gas within the gas guiding path (20), wherein the second gas space (22) is arranged between at least two additional narrow sections (23) of the gas guiding path (20) and is hydraulically connected in series with the first gas space (21).

4. The safety device (10) according to claim 1, Its features are, Due to the elastic material, the first gas space (21) can expand along at least one widening direction (24) perpendicular to the gas guiding path (20) according to the gas pressure.

5. The safety device (10) according to claim 1, Its features are, The emergency opening element (30) has at least one edge (31) that extends on the valve side (12) of the valve body (11) to extend into the single pool wall (5).

6. The safety device (10) according to claim 5, Its features are, The edge (31) is part of the tooth profile (32) of the emergency opening member (30), which is arranged on the valve outer side (12) of the valve body (11).

7. The safety device (10) according to claim 1, Its features are, The gas guiding path (20) has at least two surface regions (20.1) that are in contact with each other under normal conditions and spaced apart from each other under ventilated conditions.

8. The safety device (10) according to claim 1, Its features are, The valve body (11) has a fixed interface (13) for material-joint connection with the single pool wall (5), and / or the valve body (11) can be welded to the single pool wall (5).

9. The safety device (10) according to claim 1, Its features are, The valve body (11) is designed to be integrated into a bag-type single cell by being arranged between two single-cell membranes (2.1).

10. A single battery cell (2) for a battery module (1), having Single pool internal space (3) and A single pool wall (5) in which a safety device (10) according to any one of the preceding claims is arranged between the inner space (3) of the single pool and the outer side (4) of the single pool.

11. A battery module (1), having At least one battery single cell (2) according to claim 10 and A gas discharge system (6) is used to discharge gas from the battery cell (2) to the outside of the battery module (1).

12. A method for manufacturing a single battery cell (2) having a single cell wall (5), comprising: - Provide a safety device (10) according to any one of claims 1 to 9, - Assemble the battery cell (2), wherein a safety device (10) is arranged in the cell wall (5) between the cell interior space (3) and the cell exterior (4) of the battery cell (2).

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