Bulkhead seal

Abstract

The invention relates to a bulkhead seal for sealing a first energy storage module to a second energy storage module in a common housing, wherein the first energy storage module and the second energy storage module are separated from one another by a bulkhead. The bulkhead seal comprises a fastening region which is designed to be fastened to the bulkhead, a first sealing lip, a second sealing lip and a middle sealing lip which is arranged between the first sealing lip and the second sealing lip. A first intermediate space is thus formed between the middle sealing lip and the first sealing lip. A second intermediate space is formed between the second sealing lip and the middle sealing lip. The first sealing lip, the second sealing lip and the middle sealing lip are designed to contact the housing.The first sealing lip is configured to seal the first energy storage module from the first intermediate space, and the second sealing lip is configured to seal the second energy storage module from the second intermediate space. The middle sealing lip is configured to seal the first intermediate space from the second intermediate space.

Description

The invention relates to a bulkhead seal for sealing a first energy storage module to form a second energy storage module, and to a bulkhead with bulkhead seal, to a housing and to an electrical energy store.Electrical energy stores are increasingly being used for providing energy for electrically driven vehicles, but also for stationary applications. A frequently used energy storage system is a rechargeable storage in the form of a lithium-ion battery. 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 else metal-air batteries are also suitable. Supercapacitors are also suitable as energy storage systems. Lithium-ion batteries, like other rechargeable storage devices for electrical energy, usually have a plurality of storage cells which are installed together in a housing.Such electrical energy stores may result in safety-relevant consequences in the event of malfunction. For example, excessively high temperatures, internal and external short circuits in the individual cells can lead to irreversible damage to the energy storage system. In this context, thermal runaway (thermal runaway) is known, in particular in the case of lithium ion cells. In this case, the energy stored in the cell discharges abruptly and in an uncontrolled manner. In this case, high thermal energy amounts and gaseous and particulate reaction products are released in a short time, resulting in a high pressure and high temperatures in the housing. The reaction products released in this case must be discharged very quickly and in a targeted manner from the battery housing. For this purpose, battery housings have dedicated emergency openings through which this excess pressure can be reduced. When a cell is thermally passed through, electrically conductive particles are also ejected as reaction products, in addition to hot gases having temperatures which, depending on the cell chemistry used, may be above 1000° C., and pressures of typically at least 1 MPa. These are, for example, carbon particles or metallic particles, metal droplets and salts of different compositions. It is particularly critical if the hot particle streams can act on other cells for too long a time. These can then in turn pass through thermally, which can bring about an uncontrolled chain reaction.In this case, a plurality of storage cells which are electrically connected to one another are usually combined to form a module. The modules are generally separated from one another by partition walls. The task of these bulkhead walls is to protect the cells in an adjacent second module, in particular from the hot particle streams, when a cell passes through thermally in a first module.One conceivable construction would be to connect the bulkhead walls in a materially bonded manner downwards towards the housing base and upwards towards the cover, for example by welding. This arrangement has the technical problems that in the event of repair the individual modules are no longer accessible. Furthermore, connecting housing components made of different materials can be problematic. Furthermore, installation tolerances can make a connection of the components more difficult.It is an object of the invention to provide a bulkhead seal, a bulkhead, a housing and an electrical energy store which, with simple and cost-effective matable manufacture, enable a reliable sealing behavior between two energy store modules of an electrical energy store, in particular when cells in one of the energy store modules pass through thermally.In this case, the bulkhead seal should in particular have a rapid response behavior in the event of a sudden one-sided pressure increase and should not lose its tightness even if the bulkhead seal is exposed to hot particle flows. Furthermore, the bulkhead seal should be able to be attached to narrow bulkhead walls and allow a high tolerance compensation between the bulkhead wall and the housing.This object is achieved by a bulkhead seal having the features of claim 1, a bulkhead having the features of claim 12, a housing having the features of claim 13 and an electrical energy store having the features of claim 15. The dependent claims each show preferred developments of the invention.The bulkhead seal according to the invention having the features of claim 1 has the advantage that the bulkhead seal can seal a first energy storage module to a second energy storage module when one of the energy storage modules passes thermally. In this case, the bulkhead seal according to the invention can also continue to seal if it is struck by a hot particle stream. The bulkhead seal according to the invention has a rapid response in the event of a sudden increase in pressure and can be attached to narrow bulkhead walls. Furthermore, the bulkhead seal according to the invention enables a high tolerance compensation between the bulkhead and the housing.This is achieved according to the invention in that the bulkhead seal comprises a fastening region which is configured to be fastened to the bulkhead. Furthermore, the bulkhead seal comprises a first sealing lip, a second sealing lip and a middle sealing lip. The middle sealing lip is arranged between the first sealing lip and the second sealing lip, so that a first intermediate space is formed between the middle sealing lip and the first sealing lip and a second intermediate space is formed between the second sealing lip and the middle sealing lip. The first sealing lip, the second sealing lip and the middle sealing lip are configured to contact the housing in the installed state. The first sealing lip is configured to seal the first energy storage module from the first intermediate space. The second sealing lip is configured to seal the second energy storage module from the second intermediate space and the middle sealing lip is configured to seal the first intermediate space from the second intermediate space and the second intermediate space from the first intermediate space. Thus, the first or second sealing lip can serve as a sacrificial sealing lip in the event of a thermal runaway in the first or second energy storage module, which can and may be embrittled by a hot particle stream. The embrittled first or second sealing lip acts as a mechanical barrier which prevents, in particular, hot particle streams from further damaging elements of the bulkhead seal. In particular, the middle sealing lip is protected, which, together with the undamaged first or second sealing lip, maintains the sealing function of the bulkhead seal.The first and second intermediate spaces are open towards the outside in the uninstalled state and are closed off by the housing in the installed state.The bulkhead seal according to the invention is a profile seal. The first sealing lip, the second sealing lip and the middle sealing lip preferably have a W-shaped cross section.The bulkhead seal is preferably extruded. However, it can also be produced as a shaped part.In the installed state, the first sealing lip and the second sealing lip are preferably bent outwards from the contacting housing, so that they can seal a pressure increase from the first or second energy storage module well against the housing.The middle sealing lip is preferably compressed by the housing in the installed state, so that the middle sealing lip can reliably seal on both sides in the event of a pressure increase in the first intermediate space or second intermediate space.Preferably, the middle sealing lip has a hollow chamber. The hollow chamber enables a better tolerance compensation with a reduced pressing force of the middle sealing lip and thus contributes to a better sealing performance.Further preferably, the first sealing lip and the second sealing lip are designed mirror-symmetrically to a bulkhead wall plane. The bulkhead plane is oriented coplanarly with the bulkhead and intersects the latter centrally. A bulkhead seal can thus be made possible, which has the same sealing properties with respect to the energy storage module or with respect to the second energy storage module.According to a further preferred embodiment of the invention, the first sealing lip and the second sealing lip are higher than the middle sealing lip in the undeformed state. In the installed state, the first sealing lip and the second sealing lip thus preferably bend outwards away from the bulkhead seal and bear with an inner side of the sealing lip against the housing. Thus, the first sealing lip and the second sealing lip can seal from the outside to the first or second intermediate space in a pressure-activated manner and have a rapid response behavior.Particularly preferably, the first sealing lip and the second sealing lip are 2.3 to 3.7 times higher than the middle sealing lip in the undeformed state. This ensures that the first sealing lip and the second sealing lip securely abut on the housing and reliably seal off in the installed state.Further preferably, the first sealing lip and / or the second sealing lip are oriented at an angle of 40° to 50 to the bulkhead wall plane in the undeformed state. The angle is preferably measured from a central plane of the first and / or second sealing lip to the bulkhead wall plane. This allows for the formation of a first and second intermediate space in a narrow fastening area, which improves the sealing properties and protects the middle sealing lip. The angle of the first sealing lip and / or second sealing lip likewise enables a rapid response behavior of the seal to pressure changes and an improved protection against particle flows.The bulkhead seal preferably comprises a first middle sealing lip and a second middle sealing lip, wherein a third intermediate space is formed between the first middle sealing lip and the second middle sealing lip. In this case, the first middle sealing lip is configured to seal off the first intermediate space from the third intermediate space and the second middle sealing lip is configured to seal off the second intermediate space from the third intermediate space. The additional middle sealing lip can further improve the sealing properties of the bulkhead seal, in particular in the event of damage to the first or second sealing lip by a hot particle flow. Particularly preferably, the first middle sealing lip and the second middle sealing lip are oriented outwards at an angle to the bulkhead wall plane, so that they improve their sealing property in a pressure-activated manner.The bulkhead seal is preferably made of a silicone elastomer. Silicone elastomers have an increased temperature stability. In addition, they convert upon exposure to heat into mineral substances (silicon dioxide), which leaves behind a protective framework after a high thermal load. Thus, after destruction by thermal action, the first and second sealing lips continue to provide mechanical protection of the middle sealing lip.More preferably, the bulkhead seal comprises flame-resistant and / or abrasion-resistant fillers. Such fillers include, for example, mineral fillers in the form of particles, platelets and fibers, such as, for example, aluminum trihydroxide or other mixed metal hydroxides. The fillers allow a further improvement in the flame-resistant and abrasion-resistant properties of the bulkhead seal.Particularly preferably, the bulkhead seal has an intumescent coating. The intumescent coating is applied in particular in the first intermediate space and / or in the second intermediate space. Intumescent coatings are intumescent fire protection coatings which form an insulation layer and reduce the effect of heat on the bulkhead seal. By applying the intumescent coating in the first intermediate space and / or in the second intermediate space, the central sealing lip can be protected from the thermal load when it passes thermally in the first energy storage module or second energy storage module by activating the intumescent coating.The fastening region of the bulkhead seal is preferably configured to be plugged onto the bulkhead. Alternatively, the fastening region is configured to be introduced into a groove of the bulkhead. Between a mounted or introduced fastening region and the bulkhead, a form-fit and / or force-fit connection is preferably formed. Additionally or alternatively, the fastening region can preferably be configured to be connected to the bulkhead in a materially integral manner. A reliable connection between the bulkhead seal and the bulkhead can thus be ensured. Furthermore, the application of the bulkhead seal to thin bulkhead walls is thus made possible.The present invention further relates to a bulkhead having a bulkhead seal described above.The present invention also relates to a housing for an electrical energy store, which comprises a side wall, a cover, a base plate and a bulkhead described above.Preferably, the bulkhead seal of the housing is arranged between the bulkhead and the cover and / or between the bulkhead and the side wall and / or between the bulkhead and the base plate. This allows reliable sealing by the bulkhead, the bulkhead seal and the cover with simple assembly. Furthermore, the cover can be removed easily and non-destructively for repairs.Furthermore, the invention relates to an electrical energy store comprising a previously described housing, a first energy store module and a second energy store module, wherein the first energy store module and the second energy store module are arranged in the housing and are separated from one another by the bulkhead and the bulkhead seal.Further details, advantages and features of the present invention are evident from the following description of exemplary embodiments with reference to the drawing. It shows: FIG. 1 shows a schematic perspective illustration of an electrical energy store with a bulkhead seal according to a first exemplary embodiment, FIG. 2 shows a schematic sectional illustration of the bulkhead seal according to the first exemplary embodiment in the undeformed state, FIG. 3 shows a schematic sectional illustration of the bulkhead seal according to the first exemplary embodiment in the installed state, FIG. 4 shows a schematic sectional illustration of the bulkhead seal according to the first exemplary embodiment in the state in which it is pressure-loaded on one side, FIG. 5 shows a schematic sectional illustration of the bulkhead seal according to a second exemplary embodiment, FIG. 6 shows a schematic sectional illustration of the bulkhead seal according to a third exemplary embodiment, and FIG. 7 shows a schematic sectional illustration of the bulkhead seal according to a fourth exemplary embodiment.In the following, a bulkhead seal 1 of an electrical energy store 40 for sealing a first energy store module 41 from a second energy store module 42 in a common housing 50 according to the present invention is described in detail with reference to FIGS. 1 to 4.FIG. 1 shows a schematic structure of the electrical energy store 40 having a first energy store module 41 and a second energy store module 42. The first energy store module 41 and the second energy store module 42 are arranged in the housing 50 on a base plate 53 and are surrounded by a side wall 52 of the housing 50.The bulkhead 30 is arranged between the first energy storage module 41 and the second energy storage module 42, which bulkhead constitutes a material and thermal barrier. On the bulkhead 30, the bulkhead seal 1 according to the first embodiment is arranged, which is configured to contact a cover 51, not shown, of the housing 50. The bulkhead seal 1 extends over the entire length of the bulkhead 30. alternatively or additionally, the bulkhead seal 1 can be arranged between the bulkhead 30 and the side wall 52 and seal the electrical energy store 40 on the side wall 52.A plurality of prismatic battery cells 43 are arranged in the first energy storage module 41. The prismatic battery cells 43 have a burst opening 44, which is configured to open in a pressure- and / or temperature-activated manner in the event of a prismatic battery cell 43 undergoing thermal runaway and to discharge a cell chemistry to the outside. Preferably, a plurality of prismatic battery cells 43 are likewise arranged in the second energy storage module 42, which battery cells are not shown for the sake of illustration.The bulkhead 30 together with the bulkhead seal 1 enables reliable protection of the first energy storage module 41 and the second energy storage module 42 from damage due to thermal runaway in one of the adjacent energy storage modules 41, 42. The electrical energy storage device 40 preferably comprises a plurality of energy storage modules 41, 42 which are separated from one another by bulkhead walls 30 and bulkhead seals 1.FIG. 2 shows a sectional illustration of the bulkhead seal 1 according to the first exemplary embodiment in the undeformed state. The bulkhead seal 1 has a fastening region 20 which is configured to be plugged onto a bulkhead 30.The fastening region 20 has a first arm 22 and an opposite second arm 23, which are configured to contact the bulkhead 30 laterally on both sides and to produce a force-fit connection. In addition, an adhesive, which is introduced between the bulkhead seal 1 and the bulkhead 30, can form a cohesive connection between the bulkhead seal 1 and the bulkhead 30.Above the fastening region 20, a first sealing lip 11 and a second sealing lip 12 are attached laterally. In this case, the first sealing lip 11 merges in a smooth manner into the first arm 22 and the second sealing lip 12 merges in a smooth manner into the second arm 23. The first sealing lip 11 and the second sealing lip 12 are designed mirror-symmetrically to a bulkhead wall plane X-X. The bulkhead plane X-X is aligned coplanar with the bulkhead 30 which intersects it centrally.The first sealing lip 11 has a first central plane Y-Y, which intersects the first sealing lip 11 centrally. The first sealing lip 11 is formed such that the first center plane Y-Y is oriented at a first 45° angle α to the bulkhead plane X-X.The second sealing lip 12 has a second central plane Z-Z, which intersects the second sealing lip 12 centrally. The second sealing lip 12 is also designed such that the second center plane Z-Z is oriented at a second 45° angle β to the bulkhead plane X-X.A middle sealing lip 13 is arranged between the first sealing lip 11 and the second sealing lip 12. In this case, the partition wall plane X-X forms the central plane of the middle sealing lip 13.A first intermediate space 14 is formed between the first sealing lip 11 and the middle sealing lip 13, and a second intermediate space 15 is also formed between the second sealing lip 12 and the middle sealing lip 13.In the region of the first intermediate space 14 and the second intermediate space 15, an intumescent coating 17 is applied to the bulkhead seal 1. The intumescent coating 17 is not applied in a contact region 18 of the first sealing lip 11, second sealing lip 12 and middle sealing lip 13 in the non-pressurized state, in order not to impair its sealing properties. The contact region 18 is configured to contact the housing 50 of the electrical energy store 40.In the undeformed state, the bulkhead seal 1 preferably has a first width b 1 of 11.4 mm between the first sealing lip 11 and the second sealing lip 12. The first width b 1 is measured perpendicular to the bulkhead plane X-X and describes the maximum width of the bulkhead seal 1.The fastening region 20 has a second width b 2 of 2.5 mm between the first arm 22 and the second arm 23 in the undeformed state. The second width b2 depends on the thickness of the bulkhead 30 and is preferably selected such that there is an interference fit or transition fit between the attachment region 20 and the bulkhead 30.The first sealing lip 11 and the second sealing lip 12 have a first height h 1 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 or second intermediate space 14, 15 and the highest tip of the first sealing lip 11 or second sealing lip 12.The middle sealing lip 13 has a second height h2of 1.4 mm. The second height h2 is measured parallel to the partition wall plane X-X between the lowest point of the first or second intermediate space 14, 15 and the tip of the middle sealing lip 13. Thus, the first sealing lip 11 and the second sealing lip 12 are 2.36 times higher than the middle sealing lip 13 in the undeformed state.FIG. 3 shows the bulkhead seal 1 according to the first exemplary embodiment in the deformed state between the bulkhead 30 and the cover 51 of the housing 50.The cover 51 exerts a force on the bulkhead seal 1, so that the first sealing lip 11 and the second sealing lip 12 are bent outwards from the bulkhead plane X-X. The contact regions 18 of the bulkhead seal 1 abut the cover 51 and exert a force on the cover 51, so that the first energy storage module 41 is sealed by the first sealing lip 11 from the first intermediate space 14 and the second energy storage module 42 is sealed by the second sealing lip 12 from the second intermediate space 15. Due to the outwardly bent shape of the first and second sealing lips 11, 12, the force of the contact region 18 on the housing 50 increases in the event of a pressure increase in the first or second energy storage module 41, 42, whereby the sealing properties of the bulkhead seal 1 increase.The outwardly bent shape of the first and second sealing lips 11, 12 also increases the force of the first and second arms 22, 23 on the bulkhead 30.The middle sealing lip 13 is compressed by the cover 51 along the partition wall plane X-X, so that the middle sealing lip 13 seals well on both sides between the first intermediate space 14 and the second intermediate space 15.FIG. 4 shows a simulation result of the bulkhead seal 1 according to the first exemplary embodiment, in which a pressure of 1000 kPa is present in the electrical energy store 40 in the first energy store module 41 and a pressure of 100 kPa is present in the second energy store module 42. In this case, the bulkhead seal 1 is fastened to the bulkhead 30 and contacts the cover 51 of the housing 50.The pressure conditions simulate the load on the bulkhead seal 1 when the first energy storage module 41 passes thermally through, the bulkhead seal 1 deforms as a result of the pressure difference, the first sealing lip 11 being pressed more strongly against the cover 51 and the contact region 18 between the first sealing lip 11 and the cover 51 increasing. The middle sealing lip 13 is displaced in the direction of the second energy storage module 42 due to the pressure difference between the first energy storage module 41 and the second energy storage module 42; in this case, the contact region 18 between the middle sealing lip 13 and the cover 51 remains substantially unchanged. The second sealing lip 12 bends further in the direction of the second energy storage module 42 as a result of the pressure difference, as a result of which the contact region 18 between the second sealing lip 12 and the cover 51 decreases.If the first sealing lip 11 in connection with the thermal runaway in the first energy storage module 41 is subjected to a strong thermal load or is exposed to a particle current, so that the first sealing lip 11 is damaged and loses its density, the middle sealing lip 13 and the second sealing lip 12 continue to seal the first energy storage module 41 from the second energy storage module 42. Without the middle sealing lip 13, the second sealing lip 12 would lose its sealing property if the first sealing lip were damaged.The first sealing lip 11 protects the middle sealing lip 13 from damage even in the damaged state. In the case of a damaged first sealing lip 11, the first intermediate space 14 forms a thermal insulation layer which protects the middle sealing lip 13 from thermal damage. The intumescent coating 17 in the first interspace 14 can expand in a temperature-activated manner and further improve the thermal insulation capacity of the first interspace 14. The expansion preferably falls moderately, so that the increase in volume does not mechanically damage the middle sealing lip 13 or worsens its sealing property.FIG. 5 shows the cross section of a bulkhead seal 1 according to a second exemplary embodiment. The bulkhead seal 1 is fastened in a groove 31 of the bulkhead and seals against the cover 51 of the housing 50.The first sealing lip 11, the second sealing lip 12 and the middle sealing lip 13 of the second exemplary embodiment correspond to the first exemplary embodiment. In this case, no intumescent coating 17 is applied in the region of the first intermediate space 14 and second intermediate space 15.The fastening region 20 of the second exemplary embodiment differs from the first exemplary embodiment. The bulkhead seal 1 in FIG. 5 has three elastic barbs 24 on each side, which exert a force on the side walls of the groove 31. The fastening region 20 thus forms a force-fit connection between the bulkhead 30 and the bulkhead seal 1.By means of a corresponding structure of the groove 31, a positive connection can additionally be formed between the barbs 24 of the bulkhead seal and the bulkhead 30.FIG. 6 shows the cross section of the bulkhead seal 1 according to a third exemplary embodiment. In FIG. 6, the bulkhead seal 1 is arranged between the bulkhead 30 and the side wall 52 of the housing 50. The third exemplary embodiment has a comparable fastening region 20 as the first exemplary embodiment.In contrast to the first exemplary embodiment, the third exemplary embodiment has a first middle sealing lip 13 aand a second middle sealing lip 13 b. The additional sealing lip can increase the sealing property of the bulkhead seal 1.A third intermediate space 16 is formed between the first middle sealing lip 13 aand the second middle sealing lip 13 b. Furthermore, the first intermediate space 14 is also formed between the first sealing lip 11 and the first middle sealing lip 13 a. The second intermediate space 15 is also formed between the second sealing lip 12 and the second middle sealing lip 13 b.The first middle sealing lip 13 aand the second middle sealing lip 13 bare oriented away from the bulkhead plane X-X, so that the contact region 18 of the first sealing lip 13 ais pressed against the side wall 52 in a pressure-activated manner in the event of a pressure increase in the first intermediate space 14 and improves the sealing property of the bulkhead seal 1. The contact region 18 of the second middle sealing lip 13 bis likewise pressed against the side wall 52 of the housing 50 in a pressure-activated manner by a pressure increase in the second intermediate space 15 and improves the sealing property of the bulkhead seal 1.FIG. 7 shows a cross section of the bulkhead seal 1 according to a fourth exemplary embodiment. The bulkhead seal 1 is fixed on the bulkhead 30 and seals against the bottom plate 53 of the housing 50.The bulkhead seal 1 according to the fourth exemplary embodiment is designed analogously to the bulkhead seal 1 according to the first exemplary embodiment and differs only by a hollow chamber 21 which is arranged in the central sealing lip 13. The hollow chamber 21 is arranged centrally on the bulkhead plane X-X between the bulkhead 30 and the housing 50.The hollow chamber 21 preferably extends in the longitudinal direction over the entire length of the bulkhead seal 1.The hollow chamber 21 enables an improved flexibility of the middle sealing lip 13 along the bulkhead wall plane X-X in the direction of the bulkhead wall 30, and thus an improved tolerance compensation of the middle sealing lip 13 between the bulkhead wall 30 and the housing 50 can be ensured. Furthermore, a uniform contact pressure between the housing 50 and the middle sealing lip 13 can thus be ensured, which results in a reliable sealing property of the bulkhead seal 1.

Claims

A bulkhead seal for sealing a first energy storage module (41) to form a second energy storage module (42) in a common housing (50), wherein the first energy storage module (41) and the second energy storage module (42) are separated from one another by a bulkhead (30), comprising • a fastening region (20) which is configured to be fastened to the bulkhead (30), • a first sealing lip (11), • a second sealing lip (12) and • a middle sealing lip (13) which is arranged between the first sealing lip (11) and the second sealing lip (12), such that a first intermediate space (14) is formed between the middle 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 middle sealing lip (13), • wherein the first sealing lip (11), the second sealing lip (12) and the middle sealing lip (13) are configured, the housing (50) to be contacted, • wherein the first sealing lip (11) is configured to seal the first energy storage module (41) to the first intermediate space (14), • wherein the second sealing lip (12) is configured to seal the second energy storage module (42) to the second intermediate space (15), and • wherein the middle sealing lip (13) is configured to seal the first intermediate space (14) to the second intermediate space (15).Bulkhead seal according to Claim 1, wherein the central sealing lip (13) has a hollow chamber (21).Bulkhead seal according to one of the preceding claims, wherein the first sealing lip (11) and the second sealing lip (12) are mirror-symmetrical to a bulkhead plane (X-X).Bulkhead seal according to 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.Bulkhead 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 middle sealing lip (13) in the undeformed state.Bulkhead seal according to one of the preceding claims, wherein the first sealing lip (11) and / or the second sealing lip (12) in the undeformed state are oriented at an angle (α) of 40° to 50° with respect to the bulkhead plane (X-X).Bulkhead seal according to one of the preceding claims, comprising a first middle sealing lip (13a) and a second middle sealing lip (13b), wherein a third intermediate space (16) is formed between the first middle sealing lip (13a) and the second middle sealing lip (13b), wherein the first middle sealing lip (13a) is configured to seal the first intermediate space (14) from the third intermediate space (16), and wherein the second middle sealing lip (13b) is configured to seal the second intermediate space (15) from the third intermediate space (16).The bulkhead seal according to any one of the preceding claims, wherein the bulkhead seal (1) is made of a silicone elastomer.Bulkhead seal according to one of the preceding claims, wherein the bulkhead seal (1) comprises flame-resistant and / or abrasion-resistant fillers.Bulkhead seal according to one of the preceding claims, wherein the bulkhead seal (1) has an intumescent coating (17), in particular in the first intermediate space (14) and / or in the second intermediate space (15).Bulkhead seal according to one of the preceding claims, wherein the fastening region (20) is configured to be plugged onto the bulkhead (30) or wherein the fastening region (20) is configured to be introduced into a groove (31) of the bulkhead (30) and / or wherein the fastening region (20) is configured to be connected to the bulkhead (30) in a materially integral manner.Bulkhead with bulkhead seal (1) according to one of the preceding claims.Housing for an electrical energy store (40), comprising a side wall (51), a cover (52), a base plate (53) and a bulkhead (30) according to Claim 12.Housing according to claim 13, wherein the bulkhead seal (1) is arranged between the bulkhead (30) and the cover (51) and / or between the bulkhead (30) and the side wall (52) and / or between the bulkhead (30) and the base plate (53).Electrical energy store comprising a housing (50) according to one of claims 13 or 14, a first energy storage module (41) and a second energy storage module (42), wherein the first energy storage module (41) and the second energy storage module (42) are arranged in the housing (50) and are separated from one another by the bulkhead (30) and the bulkhead seal (1).

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