Partition wall seal

Abstract

The invention relates to a partition wall seal for sealing a first accumulator module with respect to a second accumulator module in a common housing, the first accumulator module and the second accumulator module being separated by a partition wall. The partition wall seal comprises a fixing region arranged to be fixed to the partition wall, a first sealing lip, a second sealing lip and an intermediate sealing lip arranged between the first sealing lip and the second sealing lip. Thereby, a first intermediate space is formed between the intermediate sealing lip and the first sealing lip. A second intermediate space is formed between the second sealing lip and the intermediate sealing lip. The first sealing lip, the second sealing lip and the intermediate sealing lip are arranged to be in contact with the housing. The first sealing lip is arranged to seal the first accumulator module with respect to the first intermediate space and the second sealing lip is arranged to seal the second accumulator module with respect to the second intermediate space. Here, the intermediate sealing lip is arranged to seal the first intermediate space with respect to the second intermediate space.

Description

[0001] This application is a divisional application of the invention patent application entitled "Separator Wall Seal", filed on December 24, 2024, with application number 202411910948.0. Technical Field

[0002] The present invention relates to a partition wall seal for sealing a first energy storage module relative to a second energy storage module, as well as a partition wall having the partition wall seal, a housing, and an electric energy storage device. Background Technology

[0003] Electric energy storage devices are increasingly used to power electric vehicles, but also for stationary applications. The most commonly used energy storage system here is a rechargeable energy storage device in the form of a lithium-ion battery. Besides lithium-ion batteries, lithium-sulfur batteries, solid-state batteries, sodium-ion batteries, batteries based on other light metals such as magnesium or aluminum, or metal-air batteries can also be considered. Furthermore, supercapacitors can also be considered as energy storage systems. Like other rechargeable energy storage devices for electrical energy, lithium-ion batteries typically have multiple energy storage cells housed together in a casing.

[0004] In the event of a malfunction, such an energy storage device can lead to safety-related consequences. For example, excessively high temperatures in a single battery cell, or internal and external short circuits, can cause irreversible damage to the energy storage system. In this case, thermal runaway is particularly known for lithium-ion batteries. In this situation, the energy stored in the battery cell is discharged in a surge and uncontrolled manner. A large amount of thermal energy, along with gaseous and particulate reaction products, is released in a short period, resulting in high pressure and high temperature within the casing. The released reaction products must be rapidly and selectively removed from the battery casing. For this purpose, the battery casing has a dedicated emergency opening through which overpressure can be reduced. During thermal runaway in a battery cell, in addition to hot gases, which may exceed 1000°C depending on the battery chemistry used, and typically have a pressure of at least 1 MPa, conductive particles are ejected as reaction products. These include, for example, carbon or metal particles, metal droplets, and salts of different compositions. Particularly critical is if the hot particle flow can act on other cells for too long. These other cells may then experience thermal runaway, potentially leading to an uncontrolled chain reaction.

[0005] Here, multiple electrically connected memory cells are often combined into a single module. These modules are typically separated by partitions. The purpose of these partitions is to protect cells in adjacent second modules, particularly against thermal particulate flow, in the event of thermal runaway in a cell within the first module.

[0006] One conceivable structure involves locking the partition wall material downwards to the bottom of the shell and upwards to the cover, for example, by welding. A technical problem with this arrangement is that individual modules are no longer accessible in the event of repairs. Furthermore, joining shell components made of different materials can be problematic. Additionally, installation tolerances can make joining components difficult. Summary of the Invention

[0007] The purpose of this invention is to provide a partition wall seal, a partition wall, a housing, and an electric energy storage device, which can be manufactured simply and economically, and especially achieve reliable sealing performance between the two energy storage modules in the event of thermal runaway of a battery cell in one of the energy storage modules.

[0008] Here, the partition wall seal should, in particular, have a rapid response performance in the event of a sudden unilateral pressure increase, and should not lose its sealing performance even when subjected to a hot particulate flow. Furthermore, the partition wall seal should be able to be fitted onto narrow partition walls and achieve a high degree of tolerance compensation between the partition wall and the housing.

[0009] The objective is achieved by a partition wall seal having the features of claim 1, a partition wall having the features of claim 11, a housing having the features of claim 12, and an electric energy storage device having the features of claim 14. Each dependent claim provides a preferred embodiment of the invention.

[0010] The advantage of the partition wall seal according to claim 1 is that, in the event of thermal runaway of one of the accumulator modules, the partition wall seal can seal the first accumulator module relative to the second accumulator module. At this time, the partition wall seal according to the invention can also continue to seal when it is subjected to impact from a hot particle flow. The partition wall seal according to the invention has a rapid response performance in the event of a sudden pressure increase and can be installed on narrow partition walls. Furthermore, the partition wall seal according to the invention achieves a high degree of tolerance compensation between the partition wall and the housing.

[0011] According to the invention, this is achieved by the partition wall seal including a fixing region, configured for fixing to the partition wall. Furthermore, the partition wall seal includes a first sealing lip, a second sealing lip, and an intermediate sealing lip. Here, the intermediate sealing lip is disposed between the first and second sealing lips, thereby forming a first intermediate space between the intermediate sealing lip and the first sealing lip, and a second intermediate space between the second sealing lip and the intermediate sealing lip. The first, second, and intermediate sealing lips are configured to contact the housing in the installed state. At this time, the first sealing lip is configured to seal the first accumulator module relative to the first intermediate space. The second sealing lip is configured to seal the second accumulator module relative to the second intermediate space, and the intermediate sealing lip is configured to seal both the first and second intermediate spaces relative to the second intermediate space. Thus, the first or second sealing lip can act as a sacrificial sealing lip in the event of thermal runaway in the first or second accumulator module, the sacrificial sealing lip being able to and permitted to become embrittled by hot particulate flow. Here, the embrittled first or second sealing lip serves as a mechanical barrier, specifically an element preventing further damage to the partition wall seal by hot particulate flow. In particular, the intermediate sealing lip is protected, and together with the undamaged first or second sealing lip, it maintains the sealing function of the partition wall seal.

[0012] The first and second intermediate spaces are open to the outside in the uninstalled state and closed by the housing in the installed state.

[0013] The partition wall seal according to the invention is a profile seal. Here, the first sealing lip, the second sealing lip, and the intermediate sealing lip preferably have a W-shaped cross-section.

[0014] The partition wall seal is preferably extruded. However, the partition wall seal can also be manufactured as a molded part.

[0015] In the installed state, the first and second sealing lips are preferably bent outward from the housing where they come into contact, so that the first and second sealing lips can effectively seal the pressure of the first or second accumulator module against the housing.

[0016] In the installed state, the intermediate sealing lip is preferably compressed by the housing, so that the intermediate sealing lip can reliably seal on both sides when the pressure in the first intermediate space or the second intermediate space increases.

[0017] The intermediate sealing lip preferably has a cavity. The cavity allows for better tolerance compensation when the compressive stress on the intermediate sealing lip is reduced, thereby contributing to better sealing performance.

[0018] More preferably, the first and second sealing lips are configured to be mirror-symmetrical about the partition wall plane. The partition wall plane is coplanar with respect to the partition wall and intersects the partition wall centrally. This allows for a partition wall seal that provides the same sealing performance for either the (first) accumulator module or the second accumulator module.

[0019] According to another preferred embodiment of the invention, the first and second sealing lips are higher than the intermediate sealing lip in their undeformed state. Therefore, in the installed state, the first and second sealing lips preferably bend outwards away from the partition wall seal and rest against the housing with their inner sides against the lip. Thus, the first and second sealing lips can be pressure-activated to seal from the outside relative to the first or second intermediate space and have a rapid response characteristic.

[0020] The first and second sealing lips are particularly preferably 2.3 to 3.7 times higher than the intermediate sealing lip in the undeformed state. This ensures that the first and second sealing lips fit securely against the housing and provide a reliable seal in the installed state.

[0021] The first and / or second sealing lips are further preferably oriented at an angle of 40° to 50° relative to the partition wall plane in their undeformed state. This angle is preferably measured from the midplane of the first and / or second sealing lips to the partition wall plane. This allows for the formation of first and second intermediate spaces in a narrow, fixed area, which improve sealing performance and protect the intermediate sealing lips. The angle of the first and / or second sealing lips also enables the seal to respond quickly to pressure changes and provides improved protection against particulate flow.

[0022] The partition wall seal preferably includes a first intermediate sealing lip and a second intermediate sealing lip, forming a third intermediate space between the first and second intermediate sealing lips. In this case, the first intermediate sealing lip is configured to seal the first intermediate space relative to the third intermediate space, and the second intermediate sealing lip is configured to seal the second intermediate space relative to the third intermediate space. Particularly when the first or second sealing lip is damaged due to hot particulate flow, the additional intermediate sealing lip can further improve the sealing performance of the partition wall seal. The first and second intermediate sealing lips are particularly preferably oriented outward at an angle relative to the partition wall plane, thereby improving their sealing performance under pressure activation.

[0023] The partition wall seal is preferably made of silicone elastomer. Silicone elastomers have improved temperature stability. Furthermore, under heat loading, the silicone elastomer transforms into a mineral (silica), which leaves a protective support after being subjected to high heat load. Thus, the first and second sealing lips continue to provide mechanical protection to the intermediate sealing lip even after failure due to heat loading.

[0024] More preferably, the partition wall seal includes a flame-retardant and / or abrasion-resistant filler. Such filler includes mineral fillers in the form of particles, sheets, and fibers, such as aluminum trioxide or other mixed metal oxide hydroxides. This filler allows for further improvement of the flame-retardant and abrasion-resistant properties of the partition wall seal.

[0025] Particularly preferably, the partition wall seal has an intumescent coating. The intumescent coating is particularly disposed in the first intermediate space and / or the second intermediate space. The intumescent coating is a foamed fire-retardant coating that forms a thermal insulation layer and reduces the thermal effect on the partition wall seal. By providing the intumescent coating in the first intermediate space and / or the second intermediate space, the intermediate sealing lip can be protected against thermal loads by activating the intumescent coating in the event of thermal runaway in the first or second accumulator module.

[0026] The fixing region of the partition wall seal is preferably configured for fitting onto the partition wall. Alternatively, the fixing region is configured for insertion into a groove in the partition wall. A form-locking and / or force-locking connection is preferably formed between the fitting or inserted fixing region and the partition wall. Additionally or alternatively, the fixing region is preferably configured for a material-locking connection with the partition wall. Therefore, a reliable connection between the partition wall seal and the partition wall can be ensured. Furthermore, this allows the partition wall seal to be applied to thin partition walls.

[0027] Furthermore, the present invention also relates to a partition wall having the partition wall seal described above.

[0028] Furthermore, the present invention also relates to a housing for an electric energy storage device, the housing comprising a side wall, a cover, a bottom plate, and the aforementioned partition wall.

[0029] The partition wall seal of the housing is preferably disposed between the partition wall and the cover and / or between the partition wall and the side wall and / or between the partition wall and the base plate. This allows for a reliable seal through the partition wall, the partition wall seal, and the cover while simplifying installation. Furthermore, the cover can be easily and non-destructively removed for maintenance.

[0030] Furthermore, the present invention also relates to an electric energy storage device, which includes a housing, a first energy storage module, and a second energy storage module, as described above. The first energy storage module and the second energy storage module are disposed in the housing and separated from each other by a partition wall and a partition wall seal. Attached Figure Description

[0031] Further details, advantages, and features of the invention will become apparent from the following description of embodiments with reference to the accompanying drawings. Wherein: Figure 1 A schematic perspective view of an electric energy storage device having a partition wall seal according to a first embodiment is shown. Figure 2 A schematic cross-sectional view of the partition wall seal according to the first embodiment in its undeformed state is shown. Figure 3 A schematic cross-sectional view of the partition wall seal according to the first embodiment in the installed state is shown. Figure 4 A schematic cross-sectional view of the partition wall seal according to the first embodiment under unilateral pressure loading is shown. Figure 5 A schematic cross-sectional view of the partition wall seal according to the second embodiment is shown. Figure 6 A schematic cross-sectional view of the partition wall seal according to the third embodiment is shown, and Figure 7 A schematic cross-sectional view of the partition wall seal according to the fourth embodiment is shown. Detailed Implementation

[0032] The following reference Figures 1 to 4 The invention describes in detail the partition wall seal 1 of the electric energy storage device 40 according to the invention for sealing the first energy storage module 41 relative to the second energy storage module 42 in a common housing 50.

[0033] Figure 1 A schematic structure of an electric energy storage device 40 having a first energy storage module 41 and a second energy storage module 42 is shown. The first energy storage module 41 and the second energy storage module 42 are disposed on a base plate 53 in a housing 50 and surrounded by the side walls 52 of the housing 50.

[0034] A partition wall 30 is provided between the first energy storage module 41 and the second energy storage module 42, the partition wall forming a barrier against matter and heat. A partition wall seal 1 according to a first embodiment is provided on the partition wall 30, the partition wall seal being configured to contact the cover 51 (not shown) of the housing 50. The partition wall seal 1 extends along the entire length of the partition wall 30. Alternatively or additionally, the partition wall seal 1 may be provided between the partition wall 30 and a side wall 52, sealing the electric energy storage 40 on the side wall 52.

[0035] Multiple prismatic battery cells 43 are disposed in the first energy storage module 41. Each prismatic battery cell 43 has a rupture-type pressure relief port 44, which is configured to open pressure- and / or temperature-activated in the event of thermal runaway of the prismatic battery cell 43, thereby discharging battery chemistry. A similar plurality of prismatic battery cells 43 are preferably disposed in the second energy storage module 42, which are not shown for illustrative purposes.

[0036] The partition wall 30, together with the partition wall seal, reliably protects the first accumulator module 41 and the second accumulator module 42 from damage due to thermal runaway in one of the adjacent accumulator modules 41, 42. The electric accumulator 40 preferably comprises a plurality of accumulator modules 41, 42, which are separated from each other by the partition wall 30 and the partition wall seal 1.

[0037] Figure 2 A cross-sectional view of the partition wall seal 1 according to the first embodiment in its undeformed state is shown. The partition wall seal 1 has a fixing region 20 configured to be fitted onto the partition wall 30.

[0038] The fixed region 20 has a first arm 22 and an opposing second arm 23, the first arm and the second arm being configured to contact the partition wall 30 laterally on both sides and establish a force-locking connection. Additionally, a material-locking connection can be established between the partition wall seal 1 and the partition wall 30 by introducing an adhesive between the partition wall seal 1 and the partition wall 30.

[0039] A first sealing lip 11 and a second sealing lip 12 are laterally disposed above the fixed region 20. Here, the first sealing lip 11 transitions streamlinedly into the first arm 22, and the second sealing lip 12 transitions streamlinedly into the second arm 23. The first sealing lip 11 and the second sealing lip 12 are configured in a mirror-symmetric manner about the partition wall plane XX. The partition wall plane XX is oriented coplanarly with the partition wall 30, and the partition wall intersects the partition wall plane centrally.

[0040] The first sealing lip 11 has a first mid-plane YY that intersects the first sealing lip 11 centrally. Here, the first sealing lip 11 is configured such that the first mid-plane YY is oriented at a first angle α of 45° relative to the partition wall plane XX.

[0041] The second sealing lip 12 has a second mid-plane ZZ that intersects the second sealing lip 12 centrally. Here, the second sealing lip 12 is also configured such that the second mid-plane ZZ is oriented at a second angle β of 45° relative to the partition wall plane XX.

[0042] An intermediate sealing lip 13 is provided between the first sealing lip 11 and the second sealing lip 12. Here, the partition wall plane XX forms the middle plane of the intermediate sealing lip 13.

[0043] A first intermediate space 14 is formed between the first sealing lip 11 and the intermediate sealing lip 13. Similarly, a second intermediate space 15 is formed between the second sealing lip 12 and the intermediate sealing lip 13.

[0044] In the regions of the first intermediate space 14 and the second intermediate space 15, an intumescent coating 17 is applied to the partition wall seal 1. Under no applied pressure, the intumescent coating 17 is not present in the contact areas 18 of the first sealing lip 11, the second sealing lip 12, and the intermediate sealing lip 13 to avoid degrading their sealing performance. The contact areas 18 are configured to contact the housing 50 of the energy storage device 40.

[0045] In its undeformed state, between the first sealing lip 11 and the second sealing lip 12, the partition wall seal 1 preferably has a first width b1 of 11.4 mm. The first width b1 is measured perpendicular to the partition wall plane XX and describes the maximum width of the partition wall seal 1.

[0046] In its undeformed state, the fixing region 20 has a second width b2 of 2.5 mm between the first arm 22 and the second arm 23. The second width b2 depends on the thickness of the partition wall 30 and is preferably selected such that there is an interference fit or a transition fit between the fixing region 20 and the partition wall 30.

[0047] The first sealing lip 11 and the second sealing lip 12 have a first height h1 of 3.3 mm. The first height h1 is measured parallel to the partition wall plane XX between the lowest point of the first intermediate space 14 or the second intermediate space 15 and the highest point of the first sealing lip 11 or the second sealing lip 12.

[0048] The intermediate sealing lip 13 has a second height h2 of 1.4 mm. The second height h2 is measured parallel to the partition wall plane XX between the lowest point of the first intermediate space 14 or the second intermediate space 15 and the top of the intermediate sealing lip 13. Thus, the first sealing lip 11 and the second sealing lip 12 are 2.36 times higher than the intermediate sealing lip 13 in the undeformed state.

[0049] Figure 3 The partition wall seal 1, in a deformed state, is shown between the partition wall 30 and the cover 51 of the housing 50 according to the first embodiment.

[0050] The cover 51 applies force to the partition wall seal 1, causing the first sealing lip 11 and the second sealing lip 12 to bend outward away from the partition wall plane XX. Here, the contact area 18 of the partition wall seal 1 adheres to the cover 51 and applies force to the cover 51, thereby sealing the first accumulator module 41 relative to the first intermediate space 14 via the first sealing lip 11, and sealing the second accumulator module 42 relative to the second intermediate space 15 via the second sealing lip 12. Due to the outward bending shape of the first and second sealing lips 11, 12, the force applied to the housing 50 by the contact area 18 increases when the pressure in the first or second accumulator module 41, 42 increases, thereby improving the sealing performance of the partition wall seal 1.

[0051] The outwardly curved shape of the first and second sealing lips 11, 12 also increases the force exerted by the first and second arms 22, 23 on the partition wall 30.

[0052] The intermediate sealing lip 13 is compressed by the cover 51 along the partition wall plane XX, so that the intermediate sealing lip 13 can effectively seal between the first intermediate space 14 and the second intermediate space 15 on both sides.

[0053] Figure 4 Simulation results of the partition wall seal 1 according to the first embodiment are shown. In this embodiment, there is a pressure of 1000 kPa in the electric accumulator 40 in the first accumulator module 41 and a pressure of 100 kPa in the second accumulator module 42. At this time, the partition wall seal 1 is fixed to the partition wall 30 and contacts the cover 51 of the housing 50.

[0054] This pressure relationship simulates the load on the partition wall seal 1 during thermal runaway of the first accumulator module 41. Due to the pressure difference, the partition wall seal 1 deforms, at which point the first sealing lip 11 presses more firmly against the cover 51, and the contact area 18 between the first sealing lip 11 and the cover 51 expands. Due to the pressure difference between the first accumulator module 41 and the second accumulator module 42, the intermediate sealing lip 13 moves toward the second accumulator module 42. Here, the contact area 18 between the intermediate sealing lip 13 and the cover 51 remains substantially unchanged. Due to the pressure difference, the second sealing lip 12 bends further toward the second accumulator module 42, thereby reducing the contact area 18 between the second sealing lip 12 and the cover 51.

[0055] If the first sealing lip 11 is subjected to high heat load or particulate flow in the event of thermal runaway in the first accumulator module 41, causing damage and loss of its sealing performance, then the intermediate sealing lip 13 and the second sealing lip 12 continue to seal the first accumulator module 41 relative to the second accumulator module 42. If the first sealing lip is damaged, the second sealing lip 12 will lose its sealing performance without the intermediate sealing lip.

[0056] In the event of damage, the first sealing lip 11 also protects the intermediate sealing lip 13 from further damage. When the first sealing lip 11 is damaged, a thermally insulating layer forms in the first intermediate space 14, which protects the intermediate sealing lip 13 from thermal damage. The intumescent coating 17 in the first intermediate space 14 can expand temperature-activatedly, further improving the thermal insulation capability of the first intermediate space 14. Here, the expansion occurs moderately, ensuring that the volume increase does not mechanically damage the intermediate sealing lip 13 or deteriorate its sealing performance.

[0057] Figure 5 A cross-sectional view of the partition wall seal 1 according to the second embodiment is shown. The partition wall seal 1 is fixed in the groove 31 of the partition wall and seals relative to the cover 51 of the housing 50.

[0058] The first sealing lip 11, the second sealing lip 12, and the intermediate sealing lip 13 of the second embodiment correspond to those of the first embodiment. Here, the expansion coating 17 is not provided in the regions of the first intermediate space 14 and the second intermediate space 15.

[0059] The fixed region 20 in the second embodiment differs from that in the first embodiment. Figure 5 The partition wall seal 1 has three elastic barbs 24 on each side, which apply force to the sidewall of the groove 31. Thus, the fixing area 20 forms a force-locked connection between the partition wall 30 and the partition wall seal 1.

[0060] Additionally, the corresponding structure of the groove 31 can also form a form-locking connection between the barb 24 of the partition wall seal and the partition wall 30.

[0061] Figure 6 A cross-sectional view of the partition wall seal 1 according to the third embodiment is shown. Figure 6 The partition wall seal 1 is disposed between the partition wall 30 and the side wall 52 of the housing 50. Here, the third embodiment has a fixed region 20 similar to that of the first embodiment.

[0062] In contrast to the first embodiment, the third embodiment has a first intermediate sealing lip 13a and a second intermediate sealing lip 13b. The additional sealing lips can improve the sealing performance of the partition wall seal 1.

[0063] A third intermediate space 16 is formed between the first intermediate sealing lip 13a and the second intermediate sealing lip 13b. Furthermore, the first intermediate space 14 is still formed between the first sealing lip 11 and the first intermediate sealing lip 13a. Similarly, a second intermediate space 15 is formed between the second sealing lip 12 and the second intermediate sealing lip 13b.

[0064] The first intermediate sealing lip 13a and the second intermediate sealing lip 13b are oriented XX away from the partition wall plane, so that when the pressure in the first intermediate space 14 increases, the contact area 18 of the first sealing lip 13a is pressure-activated and pressed against the side wall 52, thus improving the sealing performance of the partition wall seal 1. Similarly, the contact area 18 of the second intermediate sealing lip 13b is also pressure-activated and pressed against the side wall 52 of the housing 50 due to the pressure increase in the second intermediate space 15, thus improving the sealing performance of the partition wall seal 1.

[0065] Figure 7 A cross-sectional view of the partition wall seal 1 according to the fourth embodiment is shown. The partition wall seal 1 is fixed to the partition wall 30 and seals the bottom plate 53 of the housing 50.

[0066] The partition wall seal 1 according to the fourth embodiment is similar in construction to the partition wall seal 1 according to the first embodiment, and the only difference is the cavity 21 disposed in the intermediate sealing lip 13. The cavity 21 is disposed centrally on the partition wall plane XX between the partition wall 30 and the housing 50.

[0067] The cavity 21 preferably extends along the entire length of the partition wall seal 1 in the longitudinal direction.

[0068] The cavity 21 provides improved compliance for the intermediate sealing lip 13 along the plane XX of the partition wall towards the partition wall 30. This ensures improved tolerance compensation for the intermediate sealing lip 13 between the partition wall 30 and the housing 50. Furthermore, it ensures uniform clamping force between the housing 50 and the intermediate sealing lip 13, resulting in reliable sealing performance of the partition wall seal 1.

Claims

1. A partition wall seal for sealing a first accumulator module (41) relative to a second accumulator module (42) within a common housing (50), the first accumulator module (41) and the second accumulator module (42) being separated from each other by a partition wall (30), the partition wall seal comprising: A fixed area (20) is configured to be fixed to the partition wall (30). First sealing lip (11). The second sealing lip (12), and An intermediate sealing lip (13) is disposed between a first sealing lip (11) and a second sealing lip (12), thereby forming a first intermediate space (14) between the intermediate sealing lip (13) and the first sealing lip (11), and forming a second intermediate space (15) between the second sealing lip (12) and the intermediate sealing lip (13). The first sealing lip (11), the second sealing lip (12), and the intermediate sealing lip (13) are configured to contact the housing (50). The first sealing lip (11) is configured to seal the first accumulator module (41) relative to the first intermediate space (14). The second sealing lip (12) is configured to seal the second accumulator module (42) relative to the second intermediate space (15). The intermediate sealing lip (13) is configured to seal the first intermediate space (14) relative to the second intermediate space (15), and The partition wall seal includes a first intermediate sealing lip (13a) and a second intermediate sealing lip (13b), forming a third intermediate space (16) between the first intermediate sealing lip (13a) and the second intermediate sealing lip (13b). The first intermediate sealing lip (13a) is configured to seal the first intermediate space (14) relative to the third intermediate space (16), and the second intermediate sealing lip (13b) is configured to seal the second intermediate space (15) relative to the third intermediate space (16).

2. The partition wall seal according to claim 1, wherein, The intermediate sealing lip (13) has a cavity (21).

3. The partition wall seal according to any one of the preceding claims, wherein, The first sealing lip (11) and the second sealing lip (12) are mirror symmetrical about the partition wall plane (XX).

4. The partition wall seal according to any one of the preceding claims, wherein, The first sealing lip (11) and the second sealing lip (12) are higher than the middle sealing lip (13) in the undeformed state.

5. The partition wall seal according to claim 4, wherein, The first sealing lip (11) and the second sealing lip (12) are 2.3 to 3.7 times higher than the intermediate sealing lip (13) in the undeformed state.

6. The partition wall seal according to any one of the preceding claims, wherein, The first sealing lip (11) and / or the second sealing lip (12) are oriented at an angle (α) of 40° to 50° relative to the partition wall plane (XX) in an undeformed state.

7. The partition wall seal according to any one of the preceding claims, wherein, The partition wall seal (1) is made of silicone elastomer.

8. The partition wall seal according to any one of the preceding claims, wherein, The partition wall seal (1) includes flame-retardant and / or wear-resistant filler.

9. The partition wall seal according to any one of the preceding claims, wherein, The partition wall seal (1) has an intumescent coating (17), particularly in the first intermediate space (14) and / or the second intermediate space (15).

10. The partition wall seal according to any one of the preceding claims, wherein, The fixing region (20) is configured to be fitted onto the partition wall (30), or the fixing region (20) is configured to be inserted into a groove (31) of the partition wall (30), and / or the fixing region (20) is configured to be material-lockingly connected to the partition wall (30).

11. A partition wall having a partition wall seal (1) according to any one of the preceding claims.

12. A housing for an electric energy storage device (40), the housing comprising a side wall (51), a cover (52), a bottom plate (53), and a partition wall (30) according to claim 11.

13. The housing according to claim 12, wherein, The partition wall seal (1) is disposed between the partition wall (30) and the cover (51) and / or between the partition wall (30) and the side wall (52) and / or between the partition wall (30) and the bottom plate (53).

14. An electric energy storage device, said energy storage device comprising a housing (50) according to any one of claims 12 or 13, a first energy storage module (41) and a second energy storage module (42), wherein, The first accumulator module (41) and the second accumulator module (42) are disposed in the housing (50) and separated from each other by a partition wall (30) and a partition wall seal (1).

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