Battery Shell, Traction Battery, Motor Vehicle, and Method for Manufacturing a Battery Shell

Abstract

A battery shell, in particular, a battery shell for a traction battery of a motor vehicle, comprises a semi-permeable membrane that is integrally bonded or frictionally connected to the battery shell.

Claims

1. A battery shell, in particular a battery shell of a traction battery, the battery shell being formed from a plastics material, the battery shell having a semi-permeable membrane, the semi-permeable membrane being designed to be permeable to a gaseous substance and impermeable to a liquid substance, the battery shell having a receiving geometry for the semi-permeable membrane, the receiving geometry having a ventilation opening, the receiving geometry being designed for connection to the semi-permeable membrane, wherein the semi-permeable membrane is integrally bonded or frictionally connected to the battery shell.

2. The battery shell according to claim 1, wherein the semi-permeable membrane is connected directly to the battery shell, the semi-permeable membrane being welded or glued to the battery shell.

3. The battery shell according to claim 1, wherein the semi-permeable membrane is connected at least indirectly to the battery shell, the semi-permeable membrane being connected directly to a membrane carrier, the membrane carrier being frictionally and/or form-fittingly connected to the battery shell.

4. The battery shell according to claim 3, wherein the semi-permeable membrane is welded or glued to the membrane carrier.

5. The battery shell according to claim 3, wherein the membrane carrier is connected to the battery shell by means of a clamping means.

6. The battery shell according to claim 3, wherein the membrane carrier is pressed into the battery shell.

7. The battery shell according to claim 1, wherein the connection between the battery shell and the semi-permeable membrane is designed to release at a defined pressure difference, in particular at a pressure difference of more than 50 mbar, preferably at a pressure difference of more than 30 mbar, particularly preferably at a pressure difference of more than 15 mbar.

8. The battery shell according to claim 1, wherein the semi-permeable membrane has a predetermined breaking point, the predetermined breaking point being designed to burst at a defined pressure difference, in particular at a pressure difference of more than 50 mbar, preferably at a pressure difference of more than 30 mbar, particularly preferably at a pressure difference of more than 15 mbar.

9. The battery shell according to claim 1, wherein the receiving geometry has a bursting means, the semi-permeable membrane and the bursting means being designed such that the semi-permeable membrane comes into an operative connection with the bursting means at a defined pressure difference so that the semi-permeable membrane bursts, in particular at a pressure difference of more than 50 mbar, preferably at a pressure difference of more than 30 mbar, particularly preferably at a pressure difference of more than 15 mbar.

10. The battery shell according to claim 1, wherein the receiving geometry has no undercut.

11. The battery shell according to claim 1, wherein the receiving geometry has a support rib, preferably two support ribs, particularly preferably more than two support ribs.

12. The battery shell according to claim 1, wherein the ventilation opening is designed in the shape of a slit.

13. The battery shell according to claim 1, wherein the ventilation opening is arranged in a depression of the receiving geometry.

14. The battery shell according to claim 1, wherein the semi-permeable membrane is overmolded with a plastics material, in particular is overmolded with polyethylene.

15. The battery shell according to claim 1, the battery shell having a parting plane, wherein the receiving geometry is arranged in the battery shell such that the receiving geometry extends substantially in parallel with the parting plane of the battery shell.

16. The battery shell according to claim 1, the battery shell having an inner side, wherein the semi-permeable membrane is arranged on the inner side of the battery shell.

17. The battery shell according to any of claim 1, the battery shell having an outer side, wherein the semi-permeable membrane is arranged on the outer side of the battery shell.

18. The battery shell according to claim 1, wherein the battery shell has a parasol mushroom valve, in particular the receiving geometry has a parasol mushroom valve, in particular the membrane carrier has a parasol mushroom valve.

19. The battery shell according to claim 1, wherein the battery shell has a protective cover.

20. The battery shell according to claim 19, wherein the protective cover has a bursting means.

21. The battery shell according to claim 19, wherein the protective cover has a contacting element.

22. A traction battery, in particular a traction battery for a motor vehicle, comprising a battery shell according to claim 1.

23. A motor vehicle comprising a battery shell according to claim 1.

24. A method for manufacturing a battery shell, in particular a battery shell according to claim 1, comprising the following steps: forming the battery shell from a plastics material; providing a semi-permeable membrane; and integrally bonding or frictionally connecting the formed battery shell and the semi-permeable membrane.

Description

[0217] Further advantages, details and features of the invention can be found below in the described embodiments. The drawings show, in detail, the following:

[0218] FIG. 1: a schematic exploded view in section of a region of a battery shell according to a first embodiment comprising a receiving geometry and a semi-permeable membrane;

[0219] FIG. 2: a schematic sectional view of a region of a battery shell according to the first embodiment comprising a receiving geometry and a semi-permeable membrane;

[0220] FIG. 3: a schematic sectional view of a region of a battery shell according to a second embodiment comprising a receiving geometry and a semi-permeable membrane overmolded with plastics material;

[0221] FIG. 4: a schematic view of a semi-permeable membrane overmolded with plastics material;

[0222] FIG. 5: a schematic sectional view of a region of a battery shell according to a third embodiment comprising a receiving geometry and a semi-permeable membrane overmolded with plastics material;

[0223] FIG. 6: a schematic sectional view of a region of a battery shell according to a further embodiment comprising a receiving geometry, a semi-permeable membrane and a parasol mushroom valve;

[0224] FIG. 7: a schematic sectional view of a region of a battery shell according to a further embodiment, comprising a receiving geometry and a membrane carrier comprising a semi-permeable membrane and a parasol mushroom valve; and

[0225] FIG. 8: a schematic sectional view of a region of a battery shell according to a further embodiment comprising a receiving geometry and a membrane carrier comprising a semi-permeable membrane.

[0226] In the following description, the same reference signs denote the same components or features; in the interest of avoiding repetition, a description of a component made with reference to one drawing also applies to the other drawings. Furthermore, individual features that have been described in connection with one embodiment can also be used separately in other embodiments.

[0227] The region of a battery shell 10 according to a first embodiment in FIG. 1 has a receiving geometry 20 and a semi-permeable membrane 40, the semi-permeable membrane 40 being oriented toward the inner side 12 of the battery shell 10 in relation to the receiving geometry 20.

[0228] The receiving geometry 20 has no undercut, so that the battery shell 10 can be demolded in the direction (not shown) of the main demolding direction (not shown).

[0229] The receiving geometry 20 has a connection region 22 which is designed for an integral bond (not shown) to the semi-permeable membrane 40.

[0230] The receiving geometry 20 has a circumferential depression 26 and a protective region 24, the protective region 24 being designed to protect the semi-permeable membrane 40 from external influences (not shown). In other words, the protective region 24 is designed to impede or prevent direct accessibility of the semi-permeable membrane 40 from the outer side (not labeled) of the battery shell 10.

[0231] The receiving geometry 20 has a plurality of ventilation openings 28, the ventilation openings 28 being shaped as slits and being designed to aerate and ventilate the semi-permeable membrane 40 from the outer side (not labeled) of the battery shell 10.

[0232] The slit-shaped ventilation openings 28 are arranged in the depression 26 so that a direct jet of liquid (not shown) from the outer side (not labeled) of the battery shell 10 can be kept away from the semi-permeable membrane 40.

[0233] The receiving geometry 20 has a plurality of support ribs 30 which are designed to support the semi-permeable membrane 40 so that the possible deformation thereof (not shown) can advantageously be limited by the support ribs 30. In this way, among other things, the space required for the receiving geometry 20 can be reduced.

[0234] The connection region 22 of the receiving geometry 20 can be connected to the semi-permeable membrane 40 by means of welding (not shown) or gluing (not shown). In the case of gluing (not shown), an adhesive layer (not shown) on the connection region 22 is required for this purpose.

[0235] The region of a battery shell 10 according to a first embodiment in FIG. 2 has a receiving geometry 20 and a semi-permeable membrane 40, the semi-permeable membrane 40 being connected to the receiving geometry 20 in the connection region 22.

[0236] For this purpose, the connection region 22 has an adhesive layer (not labeled) between the receiving geometry 20 and the semi-permeable membrane 40. However, it should be expressly noted that the semi-permeable membrane 40 and the receiving geometry 20 of the battery shell 10 can also be connected by means of welding (not shown) in the connection region 22 of the receiving geometry 20.

[0237] The region of a battery shell 10 according to a second embodiment in FIG. 3 has a receiving geometry 20 and a semi-permeable membrane 40, the semi-permeable membrane 40 being oriented toward the inner side 12 of the battery shell 10 in relation to the receiving geometry 20.

[0238] The receiving geometry 20 has no undercut, so that the battery shell 10 can be demolded in the direction (not shown) of the main demolding direction (not shown).

[0239] The receiving geometry 20 of the battery shell 10 has a connection region 22 which is designed for a frictional connection (not labeled) between the receiving geometry 20 and, at least indirectly, the semi-permeable membrane 40.

[0240] The semi-permeable membrane 40 is overmolded with a plastics material (not labeled), as a result of which the membrane carrier 42 is formed. The membrane carrier 42 of the semi-permeable membrane 40 has a fitting lip 44 which is designed to facilitate the installation (not shown) of the semi-permeable membrane 40 and to increase the leaktightness (not shown) between the membrane carrier 42 of the semi-permeable membrane 40 and the connection region 22 of the receiving geometry 20.

[0241] The frictional connection (not labeled) in the connection region 22 of the receiving geometry 20 between the receiving geometry 20 and the membrane carrier 42 of the semi-permeable membrane 40 can advantageously be reversibly released and reconnected.

[0242] The receiving geometry 20 has a plurality of support ribs 30 which are designed to support the semi-permeable membrane 40 so that the possible deformation thereof (not shown) can advantageously be limited by the support ribs 30. In this way, among other things, the space required for the receiving geometry 20 can be reduced.

[0243] The semi-permeable membrane 40 in FIG. 4 is overmolded with a plastics material (not labeled), the overmolded plastics material (not labeled) having a geometry (not labeled) which forms a membrane carrier 42, a fitting lip 44, a chamfer 46 and a membrane reinforcement 48.

[0244] The membrane carrier 42 and the membrane reinforcement 48 are designed to receive and reinforce the semi-permeable membrane 40.

[0245] The membrane carrier 42 has a fitting lip 44 which is designed to facilitate the installation (not shown) of the semi-permeable membrane 40 and to increase the leaktightness (not shown) between the membrane carrier 42 of the semi-permeable membrane 40 and the designated connection region (not shown) of the designated receiving geometry (not shown).

[0246] Furthermore, the membrane carrier 42 has a chamfer 46 which is designed to facilitate the installation (not shown) of the semi-permeable membrane 40 and to center it during installation (not shown).

[0247] The region of a battery shell 10 according to a third embodiment in FIG. 5 has a receiving geometry 20 and a semi-permeable membrane 40, the semi-permeable membrane 40 being oriented toward the inner side 12 of the battery shell 10 in relation to the receiving geometry 20.

[0248] The semi-permeable membrane 40 is overmolded with a plastics material (not labeled), as a result of which the membrane carrier 42 is formed. The membrane carrier 42 of the semi-permeable membrane 40 has a fitting lip 44 which is designed to increase the leaktightness (not shown) between the membrane carrier 42 of the semi-permeable membrane 40 and the connection region 22 of the receiving geometry 20.

[0249] The frictional connection (not labeled) in the connection region 22 of the receiving geometry 20 between the receiving geometry 20 and the membrane carrier 42 of the semi-permeable membrane 40 can advantageously be reversibly released and reconnected, with the fitting lip 44 and the connection region 22 of the receiving geometry 20 of the battery shell 10 allowing an additional form-fitting connection (not labeled).

[0250] The membrane carrier 42 of the semi-permeable membrane 40 is preferably overmolded from polyethylene (not labeled), as a result of which a comparatively soft membrane carrier 42 can be achieved. As a result, the membrane carrier 42 can be reversibly connected and released more easily despite the additional form-fit (not labeled). In addition, the leaktightness (not shown) between the membrane carrier 42 and the comparatively stiffly designed receiving geometry 20 in the connection region 22 can thus be increased.

[0251] The region of a battery shell 10 in FIG. 6 has a semi-permeable membrane 40 which is integrally bonded and directly connected to the receiving geometry 20 of the battery shell 10.

[0252] Furthermore, the region of the battery shell 10 has a parasol mushroom valve 60 which is form-fittingly connected to the receiving geometry 20. In addition to at least one ventilation opening 28 which is in an operative connection with the semi-permeable membrane 40, the receiving geometry 20 has at least one further air guide opening 28 which is in an operative connection with the parasol mushroom valve 60.

[0253] The receiving geometry 20 is covered on the outer side 14 of the battery shell 10 with a protective cover 70 which protects the semi-permeable membrane 40 and the parasol mushroom valve 60 from external loads and at the same time improves the electromagnetic compatibility emanating from the battery shell 10. For this purpose, the protective cover 70 has at least one contacting element 72 which is designed for connection to further elements (not shown) to improve the electromagnetic compatibility.

[0254] The protective cover 70 has a bursting means 50 which is in an operative connection with the semi-permeable membrane 40 and is designed to burst the semi-permeable membrane 40 at high overpressures on the inner side 12 of the battery shell 10.

[0255] The protective cover 70 is form-fittingly and/or frictionally connected to the battery shell 10, in particular to the receiving geometry 20 of the battery shell 10. A flow channel (not labeled) runs at least in regions between the protective cover 70 and the battery shell 10 and is designed for gas exchange between the semi-permeable membrane 40 and/or the parasol mushroom valve 60 as well as the outer side 14 of the battery shell 10.

[0256] The region of a battery shell 10 in FIG. 7 is similar to the embodiment according to FIG. 6, but the semi-permeable membrane 40 and the parasol mushroom valve 60 are jointly received by a membrane carrier 42 which is frictionally connected to the receiving geometry 20. Thus, the semi-permeable membrane 40 is connected at least directly by means of the membrane carrier 42 to the battery shell 10.

[0257] The membrane carrier 42 also has ventilation openings (not shown/not labeled) which allow a flow exchange between the outer side 14 of the battery shell 10 and the semi-permeable membrane 40 as well as the parasol mushroom valve 60.

[0258] The membrane carrier 42 is integrally bonded to the semi-permeable membrane 40 and allows easy replacement of the semi-permeable membrane and/or the parasol mushroom valve 60.

[0259] The region of a battery shell 10 in FIG. 8 has a membrane carrier 42 which is integrally bonded to a semi-permeable membrane. The membrane carrier 42 is connected to the battery shell 10 by means of a clamping means 80.

[0260] Located between the membrane carrier 42 and the battery shell 10 is a sealing means 52, which is designed to provide sealing between the battery shell 10 and the membrane carrier 42 in normal operating states.

[0261] The clamping means 80 has a plurality of clamping elements 82 which extend outwardly in the radial direction in a finger-like manner from the central region of the clamping means 80 and which in turn are in contact with the battery shell 10. Between each of the clamping elements 82 there is a free cross section (not labeled/not shown) which, in the event of a particularly high pressure difference, in particular triggered by a thermal escalation of a battery module, allows the high pressure difference to lift the membrane carrier 42 off the sealing means 52, as a result of which the pressure difference between the inner side 12 and the outer side 14 of the battery shell does not have to be dissipated solely by the semi-permeable membrane 40, but can be dissipated via a bypass channel which opens as a result. The level of the pressure difference required for this can be determined by the design of the clamping means.

[0262] Furthermore, the battery shell 10 has a protective cover 70 on the outer side 14.

[0263] The protective cover is preferably connected to the membrane carrier 42 and together with the membrane carrier 42 can be fastened in the battery shell 10 by means of the clamping means 80.

[0264] A flow channel (not labeled) runs at least in regions between the protective cover 70 and the battery shell 10 and is designed for gas exchange between the semi-permeable membrane 40 and the outer side 14 of the battery shell 10.

LIST OF REFERENCE SIGNS

[0265] 10 Battery shell [0266] 12 Inner side [0267] 14 Outer side [0268] 20 Receiving geometry [0269] 22 Connection region [0270] 24 Protective region [0271] 26 Depression [0272] 28 Ventilation opening [0273] 30 Support rib [0274] 40 Semi-permeable membrane [0275] 42 Membrane carrier [0276] 44 Fitting lip [0277] 46 Chamfer [0278] 48 Membrane reinforcement [0279] 50 Bursting means [0280] 52 Sealing means [0281] 60 Parasol mushroom valve [0282] 70 Protective cover [0283] 72 Contacting element [0284] 80 Clamping means [0285] 82 Clamping element