Partition wall seal

Abstract

The invention relates to a partition wall seal for sealing a first energy storage module against a second energy storage module in a common housing, the first energy storage module and the second energy storage module being separated by a partition wall. The partition wall seal includes a securing region configured to be secured to the partition wall, a first sealing lip, a second sealing lip, and an intermediate sealing lip disposed between the first sealing lip and the second sealing lip. As a result, 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 middle sealing lip are arranged to be in contact with the shell. A first sealing lip is arranged to seal the first energy accumulator module with respect to the first intermediate space and a second sealing lip is arranged to seal the second energy accumulator module with respect to the second intermediate space. Here, the intermediate sealing lip is configured to seal the first intermediate space with respect to the second intermediate space.

Description

Technical Field

[0001] 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 electrical energy storage device. Background Art

[0002] Electrical energy storage devices are increasingly being used to supply energy for electrically driven vehicles, but also for stationary applications. Here, the energy storage systems commonly used are rechargeable energy storage devices in the form of lithium-ion batteries. In addition to lithium-ion batteries, lithium-sulfur batteries, solid-state batteries, sodium-ion batteries, batteries based on other light metals such as magnesium or aluminum, or also metal-air batteries can also be considered. Furthermore, it is also possible to consider using supercapacitors as energy storage systems. Like other rechargeable energy storage devices for electrical energy, lithium-ion batteries mostly have a plurality of energy storage units that are jointly installed in a housing.

[0003] In case of a malfunction, such an electrical energy storage device can lead to safety-related consequences. Thus, for example, an excessive temperature in a single battery cell, 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. At this time, the energy stored in the battery cell is discharged in an impact-like and uncontrolled manner. At this time, a large amount of thermal energy as well as gaseous and particulate reaction products are released within a short time, thereby resulting in high pressure and high temperature in the housing. The reaction products released at this time must be quickly and specifically discharged from the battery housing. For this purpose, the battery housing has a dedicated emergency opening through which the overpressure can be reduced. In the case of thermal runaway occurring in a battery cell, in addition to hot gases with a temperature that may be higher than 1000 °C and a pressure that is usually at least 1 MPa according to the battery chemistry used, conductive particles are also ejected as reaction products. These are, for example, carbon particles or metal particles, metal droplets, and salts of different components. What is particularly critical is if the hot particle stream may act on other cells for too long. At this time, thermal runaway will occur in these other cells again, which may lead to an uncontrolled chain reaction.

[0004] Here, a plurality of mutually electrically connected memory units are mostly combined into a module. These modules are usually separated from each other by partition walls. The task of these partition walls is to protect the battery cells in an adjacent second module, especially against the hot particle stream, when a thermal runaway occurs in a battery cell in the first module.

[0005] One conceivable structure is to lockingly connect the partition wall material downward to the bottom of the housing and upward to the lid, for example by welding. The technical problem with this arrangement is that in the case of repairs, the individual modules can no longer be accessed. In addition, the connection of housing components made of different materials can be problematic. In addition, the installation tolerances can make the connection of the components difficult. Summary of the Invention

[0006] The object of the present invention is to provide a partition wall seal, a partition wall, a housing and an electric energy storage device, which can be simply and economically manufactured, and in particular, when a battery cell in one of the energy storage modules undergoes thermal runaway, a reliable sealing performance is achieved between two energy storage modules of the electric energy storage device.

[0007] 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 the sealing performance of the partition wall seal even when the partition wall seal is subjected to a flow of hot particles. In addition, the partition wall seal should be able to be arranged on a narrow partition wall and achieve a high degree of tolerance compensation between the partition wall and the housing.

[0008] The object is achieved by a partition wall seal having the features of claim 1, a partition wall having the features of claim 12, a housing having the features of claim 13 and an electric energy storage device having the features of claim 15. The dependent claims each give preferred refinements of the invention.

[0009] The advantage of the partition wall seal according to the invention having the features of claim 1 is that when one of the energy storage modules undergoes thermal runaway, the partition wall seal can seal the first energy storage module relative to the second energy storage module. At this time, the partition wall seal according to the invention can also continue to seal when it is impacted by a flow of hot particles. The partition wall seal according to the invention has a rapid response performance in the event of a sudden pressure increase and can be arranged on a narrow partition wall. In addition, the partition wall seal according to the invention achieves a high degree of tolerance compensation between the partition wall and the housing.

[0010] According to the present invention, this is achieved in such a way that the partition wall seal includes a fixing region which is arranged to be fixed to the partition wall. In addition, the partition wall seal includes a first sealing lip, a second sealing lip and an intermediate sealing lip. Here, the intermediate sealing lip is arranged between the first sealing lip and the second sealing lip, so that a first intermediate space is formed between the intermediate sealing lip and the first sealing lip, and 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 in the installed state to be in contact with the housing. At this time, the first sealing lip is arranged to seal the first accumulator module with respect to the first intermediate space. The second sealing lip is arranged to seal the second accumulator module with respect to the second intermediate space, and the intermediate sealing lip is arranged to seal the first intermediate space with respect to the second intermediate space and seal the second intermediate space with respect to the first intermediate space. Thus, the first or second sealing lip can be used as a sacrificial sealing lip when a thermal runaway occurs in the first or second accumulator module, and the sacrificial sealing lip can and is allowed to embrittle through the thermal particle flow. Here, the embrittled first or second sealing lip serves as a mechanical barrier which especially prevents the thermal particle flow from further damaging the elements of the partition wall seal. In particular, the intermediate sealing lip is protected, and the intermediate sealing lip together with the undamaged first or second sealing lip maintains the sealing function of the partition wall seal.

[0011] The first and second intermediate spaces are open outwards in the uninstalled state and are closed by the housing in the installed state.

[0012] The partition wall seal according to the present 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.

[0013] The partition wall seal is preferably extruded. However, the partition wall seal can also be manufactured as a molded part.

[0014] In the installed state, the first sealing lip and the second sealing lip preferably bend outwards from the housing where they come into contact, so that the first sealing lip and the second sealing lip can seal the pressure increase of the first or second accumulator module well against the housing.

[0015] In the installed state, the intermediate sealing lip is preferably compressed by the housing, so that the intermediate sealing lip can seal reliably on both sides when the pressure in the first intermediate space or the second intermediate space increases.

[0016] The intermediate sealing lip preferably has a cavity. The cavity enables better tolerance compensation when the extrusion pressure of the intermediate sealing lip decreases and thus helps to achieve better sealing performance.

[0017] Further preferably, the first sealing lip and the second sealing lip are configured to be mirror-symmetrical with respect to the partition wall plane. The partition wall plane is oriented coplanar with the partition wall and intersects the partition wall centrally. Thereby, a partition wall seal can be achieved that has the same sealing performance for the (first) accumulator module or for the second accumulator module.

[0018] According to another preferred design of the invention, the first sealing lip and the second sealing lip are higher than the intermediate sealing lip in the undeformed state. Thereby, in the installed state, the first sealing lip and the second sealing lip preferably bend outwardly away from the partition wall seal and bear against the housing with the inner side of the sealing lip. Thus, the first sealing lip and the second sealing lip can seal the first intermediate space or the second intermediate space pressure-activatable from the outside and have a fast response characteristic.

[0019] The first sealing lip and the second sealing lip are particularly preferably 2.3 to 3.7 times higher than the intermediate sealing lip in the undeformed state. This ensures that the first sealing lip and the second sealing lip bear firmly against the housing in the installed state and seal reliably.

[0020] The first sealing lip and / or the second sealing lip are further preferably oriented at an angle of 40° to 50° with respect to the partition wall plane in the undeformed state. The angle is preferably measured from the mid-plane of the first and / or second sealing lip to the partition wall plane. This enables the formation of the first and second intermediate spaces in a narrow fixing area, which improve the sealing performance and protect the intermediate sealing lip. The angle of the first sealing lip and / or the second sealing lip also achieves a fast response performance of the seal to pressure changes and improved protection against particle flow.

[0021] The partition wall seal preferably includes a first intermediate sealing lip and a second intermediate sealing lip, and a third intermediate space is formed between the first intermediate sealing lip and the second intermediate sealing lip. At this time, the first intermediate sealing lip is arranged to seal the first intermediate space with respect to the third intermediate space, and the second intermediate sealing lip is arranged to seal the second intermediate space with respect to the third intermediate space. Especially when the first or second sealing lip is damaged due to hot particle flow, the additional intermediate sealing lip can further improve the sealing performance of the partition wall seal. The first intermediate sealing lip and the second intermediate sealing lip are particularly preferably oriented outwardly at an angle with respect to the partition wall plane, so that the first intermediate sealing lip and the second intermediate sealing lip improve their sealing performance pressure-activatable.

[0022] The partition wall seal is preferably made of silicone elastomer. The silicone elastomer has improved temperature stability. In addition, upon thermal loading, the silicone elastomer is converted into a mineral (silica), which leaves a protective scaffold after being subjected to a high heat load. Thereby, the first and second sealing lips continue to provide mechanical protection to the intermediate sealing lip after being damaged due to thermal loading.

[0023] Further preferably, the partition wall seal includes a flame retardant and / or wear-resistant filler. Such fillers include, for example, mineral fillers in the form of granules, platelets, and fibers, such as aluminum trihydroxide or other mixed metal hydroxide oxides (Metallmischoxidhydroxide). The fillers enable further improvement of the flame retardant and wear-resistant properties of the partition wall seal.

[0024] Particularly preferably, the partition wall seal has an intumescent coating. The intumescent coating is especially provided in the first intermediate space and / or the second intermediate space. The intumescent coating is a foaming fire protection coating, which forms a heat-insulating 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, when a thermal runaway occurs in the first accumulator module or the second accumulator module, the intermediate sealing lip against the thermal load can be protected by activating the intumescent coating.

[0025] The fixing area of the partition wall seal is preferably arranged for being sleeved onto the partition wall. Alternatively, the fixing area is arranged for being inserted into a groove of the partition wall. A form-fitting and / or force-fitting connection is preferably formed between the sleeved or inserted fixing area and the partition wall. Additionally or alternatively, the fixing area can preferably be arranged for connecting to the partition wall in a material-locking manner. Thus, a reliable connection between the partition wall seal and the partition wall can be ensured. In addition, this enables the partition wall seal to be applied to a thin partition wall.

[0026] Furthermore, the present invention also relates to a partition wall having the aforementioned partition wall seal.

[0027] Furthermore, the present invention also relates to a housing for an electric energy accumulator, which includes a side wall, a lid, a bottom plate, and the aforementioned partition wall.

[0028] The partition wall seal of the housing is preferably provided between the partition wall and the lid and / or between the partition wall and the side wall and / or between the partition wall and the bottom plate. This enables reliable sealing to be achieved through the partition wall, the partition wall seal, and the lid while facilitating installation. In addition, for maintenance, the lid can be simply and non-destructively removed.

[0029] Furthermore, the present invention also relates to an electric accumulator, which comprises the housing, the first accumulator module and the second accumulator module as described above for the electric accumulator. The first accumulator module and the second accumulator module are arranged in the housing and separated from each other by a partition wall and a partition wall seal. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Other details, advantages and features of the present invention will become apparent from the following description of embodiments with reference to the drawings. Among them:

[0031] Figure 1 Fig. shows a schematic perspective view of an electric accumulator having a partition wall seal according to a first embodiment,

[0032] Figure 2 Fig. shows a schematic cross-sectional view of the partition wall seal according to the first embodiment in an undeformed state,

[0033] Figure 3 Fig. shows a schematic cross-sectional view of the partition wall seal according to the first embodiment in an installed state,

[0034] Figure 4 Fig. shows a schematic cross-sectional view of the partition wall seal according to the first embodiment under a unilateral pressure loading state,

[0035] Figure 5 Fig. shows a schematic cross-sectional view of the partition wall seal according to the second embodiment,

[0036] Figure 6 Fig. shows a schematic cross-sectional view of the partition wall seal according to the third embodiment, and

[0037] Figure 7 Fig. shows a schematic cross-sectional view of the partition wall seal according to the fourth embodiment. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0038] The following refers to Figures 1 to 4 A detailed description is given of a partition wall seal 1 for sealing a first accumulator module 41 relative to a second accumulator module 42 in a common housing 50 of an electric accumulator 40 according to the present invention.

[0039] Figure 1 Fig. shows a schematic structure of an electric accumulator 40 having a first accumulator module 41 and a second accumulator module 42. The first accumulator module 41 and the second accumulator module 42 are arranged on a bottom plate 53 in a housing 50 and surrounded by a side wall 52 of the housing 50.

[0040] A partition wall 30 is provided between a first accumulator module 41 and a second accumulator module 42, and the partition wall forms a barrier for substances and heat. A partition wall seal 1 according to the first embodiment is provided on the partition wall 30, and the partition wall seal is arranged to be in contact with a lid 51 (not shown) of a housing 50. The partition wall seal 1 extends over the entire length of the partition wall 30. Alternatively or additionally, the partition wall seal 1 can be provided between the partition wall 30 and a side wall 52 and seal the electrical accumulator 40 on the side wall 52.

[0041] A plurality of prismatic battery cells 43 are provided in the first accumulator module 41. The prismatic battery cells 43 have rupture-type pressure relief openings 44, and the rupture-type pressure relief openings are arranged to be activated and opened by pressure and / or temperature in the case of thermal runaway of the prismatic battery cells 43 and lead out battery chemicals to the outside. Preferably, a plurality of prismatic battery cells 43 are also provided in the second accumulator module 42, and these battery cells are not shown for reasons of illustration.

[0042] The partition wall 30 together with the partition wall seal enables reliable protection of the first accumulator module 41 and the second accumulator module 42 against damage due to thermal runaway in one of the adjacent accumulator modules 41, 42. The electrical accumulator 40 preferably includes a plurality of accumulator modules 41, 42, and these accumulator modules are separated from each other by the partition wall 30 and the partition wall seal 1.

[0043] Figure 2 A cross-sectional view of the partition wall seal 1 according to the first embodiment in an undeformed state is shown. The partition wall seal 1 has a fixing area 20 arranged to be sleeved onto the partition wall 30.

[0044] The fixing area 20 has a first arm 22 and an opposing second arm 23, and the first arm and the second arm are arranged to be in contact with the partition wall 30 on both sides laterally and establish a form-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.

[0045] A first sealing lip 11 and a second sealing lip 12 are provided laterally above the fixing area 20. Here, the first sealing lip 11 transitions smoothly into the first arm 22, and the second sealing lip 12 transitions smoothly into the second arm 23. The first sealing lip 11 and the second sealing lip 12 are formed to be mirror-symmetrical with respect to the partition wall plane X-X. The partition wall plane X-X is oriented coplanarly with the partition wall 30, and the partition wall intersects the partition wall plane at the center.

[0046] The first sealing lip 11 has a first median plane Y-Y that intersects the first sealing lip 11 centrally. Here, the first sealing lip 11 is configured such that the first median plane Y-Y is oriented at a first angle α of 45° with respect to the partition wall plane X-X.

[0047] The second sealing lip 12 has a second median plane Z-Z that intersects the second sealing lip 12 centrally. Here, the second sealing lip 12 is likewise configured such that the second median plane Z-Z is oriented at a second angle β of 45° with respect to the partition wall plane X-X.

[0048] An intermediate sealing lip 13 is provided between the first sealing lip 11 and the second sealing lip 12. Here, the partition wall plane X-X forms the median plane of the intermediate sealing lip 13.

[0049] 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.

[0050] In the regions of the first intermediate space 14 and the second intermediate space 15, an expandable coating 17 is applied to the partition wall seal 1. In the state without pressure loading, the expandable coating 17 is not provided in the contact regions 18 of the first sealing lip 11, the second sealing lip 12, and the intermediate sealing lip 13 so as not to deteriorate their sealing performance. The contact regions 18 are arranged to contact the housing 50 of the electrical energy storage 40.

[0051] In the 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 X-X and describes the maximum width of the partition wall seal 1.

[0052] In the 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.

[0053] 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 X-X between the lowest point of the first intermediate space 14 or the second intermediate space 15 and the highest tip of the first sealing lip 11 or the second sealing lip 12.

[0054] 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 end 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.

[0055] Figure 3 Figure 4 shows the partition wall seal 1 in a deformed state between the partition wall 30 and the lid 51 of the housing 50 according to the first embodiment.

[0056] The lid 51 exerts a force on the partition wall seal 1, so that the first sealing lip 11 and the second sealing lip 12 bend outwardly away from the partition wall plane X-X. Here, the contact area 18 of the partition wall seal 1 abuts against the lid 51 and exerts a force on the lid 51, so that the first accumulator module 41 is sealed relative to the first intermediate space 14 by the first sealing lip 11, and the second accumulator module 42 is sealed relative to the second intermediate space 15 by the second sealing lip 12. Due to the outwardly bent shape of the first and second sealing lips 11, 12, when the pressure in the first or second accumulator module 41, 42 increases, the force exerted by the contact area 18 on the housing 50 increases, whereby the sealing performance of the partition wall seal 1 is improved.

[0057] The outwardly bent 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.

[0058] The intermediate sealing lip 13 is compressed by the lid 51 along the partition wall plane X-X, so that the intermediate sealing lip 13 seals well between the first intermediate space 14 and the second intermediate space 15 on both sides.

[0059] Figure 4 Figure 17 shows the simulation results of the partition wall seal 1 according to the first embodiment, in which there is a pressure of 1000 kPa in the electrical 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 in contact with the lid 51 of the housing 50.

[0060] This pressure relationship simulates the load on the partition seal 1 during thermal runaway in the first accumulator module 41. Due to the pressure difference, the partition seal 1 deforms. At this time, the first sealing lip 11 presses more strongly against the lid 51, and the contact area 18 between the first sealing lip 11 and the lid 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 in the direction of the second accumulator module 42. Here, the contact area 18 between the intermediate sealing lip 13 and the lid 51 remains substantially unchanged. Due to the pressure difference, the second sealing lip 12 bends further in the direction of the second accumulator module 42, whereby the contact area 18 between the second sealing lip 12 and the lid 51 decreases.

[0061] If the first sealing lip 11 is subjected to a high heat load or a particle flow during thermal runaway in the first accumulator module 41, such that the first sealing lip 11 is damaged and loses its sealing performance, 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. When the first sealing lip is damaged, without the intermediate sealing lip, the second sealing lip 12 would lose its sealing performance.

[0062] In the damaged state, the first sealing lip 11 also protects the intermediate sealing lip 13 from damage. When the first sealing lip 11 is damaged, the first intermediate space 14 forms a thermal insulation layer that protects the intermediate sealing lip 13 from thermal damage. The swelling-type coating 17 in the first intermediate space 14 can swell in a temperature-activated manner and further improve the thermal insulation ability of the first intermediate space 14. Here, the swelling occurs moderately such that the volume increase does not mechanically damage the intermediate sealing lip 13 or deteriorate its sealing performance.

[0063] Figure 5 Shows a cross-sectional view of the partition seal 1 according to the second embodiment. The partition seal 1 is fixed in the groove 31 of the partition wall and seals relative to the lid 51 of the housing 50.

[0064] 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, no swelling-type coating 17 is provided in the regions of the first intermediate space 14 and the second intermediate space 15.

[0065] The fixing region 20 of the second embodiment is different from that of the first embodiment. Figure 5 The partition seal 1 in has three elastic barbs 24 on each side, which exert a force on the side wall of the groove 31. Thereby, a form-locking connection is formed in the fixing region 20 between the partition wall 30 and the partition seal 1.

[0066] By means of the corresponding structure of the groove 31, a form - fit connection can additionally be formed between the barb 24 of the partition wall seal and the partition wall 30.

[0067] Figure 6 Fig. shows a transverse cross - section of the partition wall seal 1 according to the third embodiment. Figure 6 The partition wall seal 1 in is arranged between the partition wall 30 and the side wall 52 of the housing 50. Here, the third embodiment has a fixing area 20 similar to the first embodiment.

[0068] Contrary 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.

[0069] A third intermediate space 16 is formed between the first intermediate sealing lip 13a and the second intermediate sealing lip 13b. In addition, a first intermediate space 14 is still formed between the first sealing lip 11 and the first intermediate sealing lip 13a. In addition, a second intermediate space 15 is also formed between the second sealing lip 12 and the second intermediate sealing lip 13b.

[0070] The first intermediate sealing lip 13a and the second intermediate sealing lip 13b are oriented away from the partition wall plane X - X, 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 to press against the side wall 52 and improves the sealing performance of the partition wall seal 1. The contact area 18 of the second intermediate sealing lip 13b is also pressure - activated to press against the side wall 52 of the housing 50 due to the increase in pressure in the second intermediate space 15, and improves the sealing performance of the partition wall seal 1.

[0071] Figure 7 Fig. shows a transverse cross - section of the partition wall seal 1 according to the fourth embodiment. The partition wall seal 1 is fixed to the partition wall 30 and seals against the bottom plate 53 of the housing 50.

[0072] The partition wall seal 1 according to the fourth embodiment is formed similar to the partition wall seal 1 according to the first embodiment, and the only difference is the cavity 21 provided in the intermediate sealing lip 13. The cavity 21 is arranged centrally in the partition wall plane X - X between the partition wall 30 and the housing 50.

[0073] The cavity 21 preferably extends along the longitudinal direction over the entire length of the partition wall seal 1.

[0074] The cavity 21 enables the intermediate sealing lip 13 to have improved flexibility in the direction of the partition wall plane X-X towards the partition wall 30. Thereby, an improved tolerance compensation for the intermediate sealing lip 13 between the partition wall 30 and the housing 50 can be ensured. In addition, a uniform pressing force between the housing 50 and the intermediate sealing lip 13 can be ensured thereby, which achieves a 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) in 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 fixing area (20) configured to be fixed to the partition wall (30), · A first sealing lip (11) · A second sealing lip (12), and · An intermediate sealing lip (13) disposed between the first sealing lip (11) and the second sealing lip (12) such that a first intermediate space (14) is formed between the intermediate sealing lip (13) and the first sealing lip (11), and a second intermediate space (15) is formed 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), and · The intermediate sealing lip (13) is configured to seal the first intermediate space (14) relative to the second intermediate space (15).

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

3. The dividing 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 with respect to the partition wall plane (X-X).

4. The dividing 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 intermediate sealing lip (13) in an 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 an undeformed state.

6. The dividing 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° with respect to the partition wall plane (X-X) in an undeformed state.

7. The partition wall seal according to any one of the preceding claims, the partition wall seal comprising a first intermediate sealing lip (13a) and a second intermediate sealing lip (13b), a third intermediate space (16) being formed between the first intermediate sealing lip (13a) and the second intermediate sealing lip (13b), the first intermediate sealing lip (13a) being configured to seal the first intermediate space (14) relative to the third intermediate space (16), and the second intermediate sealing lip (13b) being configured to seal the second intermediate space (15) relative to the third intermediate space (16).

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

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

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

11. The dividing wall seal according to any one of the preceding claims, wherein, The fixing region (20) is configured to be sleeved 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 connected to the partition wall (30) in a material-locking manner.

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

13. A housing for an electrical energy storage device (40), the housing including a side wall (51), a lid (52), a bottom plate (53), and the partition wall (30) according to claim 12.

14. The housing according to claim 13, wherein, The partition wall seal (1) is disposed between the partition wall (30) and the lid (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).

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

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