Sealing element for rectangular battery cell cover assembly and cover assembly having such sealing element

Abstract

A sealing element (14, 14') for a lid assembly (1) suitable for fluid-tightly closing the internal compartment (3) of a prismatic battery cell is described, wherein the sealing element (14, 14') is interposed between the current collector (5) of the lid assembly (1) and the base plate (4) of the lid assembly (1) to electrically insulate the current collector (5) and the lid assembly (1) from each other and to fluid-tightly seal the internal compartment (3), wherein the sealing element (14, 14') has a central axis (B) and exhibits a substantially L-shaped semi-contour with respect to the central axis (B), The device comprises an axial collar (15) that extends in an annular shape around a central axis (B) and is configured to electrically insulate the current collector (5) from the base plate (4), and a radial sealing portion (16) that cantileveres out from the collar (15) and is configured to fluidly seal the internal compartment (3), wherein the sealing portion (16) comprises a main body (17) and a projection or raised portion (18) that extends from the main body (17) and defines the free end of the sealing portion (16), and the projection or raised portion (18) has an axial size larger than the axial size of the main body (17).

Description

Technical Field

[0001] The present invention relates to a sealing element for a lid assembly of a rectangular battery cell, particularly for fluid-tightly closing and sealing an internal compartment of a rectangular battery cell that houses electrodes and electrolyte materials.

[0002] The present invention also relates to a lid assembly for a rectangular battery cell having such a sealing element.

Background Art

[0003] Battery cells used as electrical energy accumulators are known.

[0004] In particular, so-called primary batteries, which cannot be easily recharged and are therefore defined as single-use, and so-called secondary batteries, which can be repeatedly recharged after each cycle of use, are known.

[0005] Secondary-type single-cell batteries used in various portable small electronic devices such as mobile phones, wristwatches, smartwatches, smart bands, etc. are known.

[0006] Batteries with a plurality of cells connected in series or parallel, such as those used in the automotive industry, are also known.

[0007] Although the present invention refers to battery cells for use in the batteries of hybrid or fully electric vehicles, generality is not lost.

[0008] Secondary battery cells can be manufactured in various types such as cylindrical or rectangular cells.

[0009] Although the present invention refers to rectangular battery cells, generality is not lost.

[0010] A prismatic battery cell typically comprises a hollow prismatic housing, usually made of a metal material and, for example, having a parallelepiped shape, and two electrodes (cathode and anode) housed within the housing, which define the internal compartments of the cell.

[0011] The compartment also houses a separator material that electrically interposes between the two electrodes.

[0012] Within the compartment, the electrodes and separators are typically immersed in a liquid or gelatinous electrolyte.

[0013] The battery cell also includes at least one lid assembly that is coupled to the housing to close the compartment.

[0014] More specifically, the housing generally has at least one (rectangular) opening, usually located on its top, through which electrodes, separators, and electrolyte are inserted into the compartment. A lid assembly is coupled to the housing to close such an opening.

[0015] The lid assembly is typically, A typically metal base plate configured to fit and engage with the opening to close the opening of the housing, A current collector for each electrode is electrically connected to the associated electrode and configured to collect electrical energy from such electrode and supply it from the internal compartment to the external environment. Each electrode has terminals configured to receive a connector for a consumer device that is electrically connected to the collector to receive electrical energy from the collector and must be powered by a battery cell, It is equipped with.

[0016] The lid assembly further includes sealing elements for each current collector, which are made of an elastic electrical insulating material and perform a dual function: electrically insulating the collector from the base plate and fluidly sealing the internal compartment of the housing from the external environment.

[0017] Therefore, the sealing element is mechanically interposed between each collector and the base plate, so that the collector and the base plate are not in direct contact with each other, but are connected to each other only through the sealing element itself.

[0018] In some configurations, the housing has two openings, one for each electrode, for example, two lateral openings. In this case, the battery has two lid assemblies, one for each electrode, each having its own base plate, a single terminal, a single collector, and a single sealing element.

[0019] Generally, the sealing element is defined by a simple O-ring.

[0020] According to some known configurations, the sealing element is L-shaped.

[0021] In light of the above, the lid assembly provides a fluid-tight seal to the internal compartment.

[0022] Therefore, the sealing element (which defines the gasket of the lid assembly) is configured to prevent the electrolyte from leaking out of the internal compartment and / or the unwanted intrusion of external impurities (dust, sand) into the internal compartment.

[0023] It is also known that internal compartments are pressurized to ensure optimal operation of the battery cells.

[0024] Furthermore, it is well known that during operation, electrolytic gas is generated, and this gas permeates the internal compartment, causing a pressure increase. Such a pressure increase causes stress on the sealing element.

[0025] The applicant observed how there is room for further improvement in known sealing elements for the aforementioned types of lid assemblies, particularly with respect to fluid sealing effect, electrical insulation effect, and the lifespan of the sealing element itself. [Overview of the project]

Problems to be Solved by the Invention

[0026] Therefore, it is an object of the present invention to provide a seal element designed to simply and at low cost satisfy at least one of the above-described needs, and a lid assembly for a square battery cell including such a seal element.

Means for Solving the Problems

[0027] This object is achieved by a seal element and a lid assembly as set forth in the appended claims.

[0028] Non-limiting embodiments of the present invention will be described by way of example with reference to the accompanying drawings.

Brief Description of the Drawings

[0029] [Figure 1] FIG. 1 is an exploded view of a lid assembly for a square battery cell including a seal element according to the present invention, with parts removed for clarity. [Figure 2] FIG. 2 is an enlarged side view of the lid assembly of FIG. 1 in its assembled state. [Figure 3] FIG. 3 is a partially enlarged cross-sectional perspective view of the lid assembly of FIG. 1 in its assembled configuration, showing particularly the region where the seal element is disposed. [Figure 4] FIG. 4 is a cross-sectional view of a seal element according to the present invention. [Figure 5] FIG. 5 is a side view of an alternative configuration of the seal element.

Modes for Carrying Out the Invention

[0030] Referring to FIG. 1, reference numeral 1 generally designates a lid assembly for a square battery cell.

[0031] In particular, the battery cell is of a square type and has a hollow square housing 2 that defines an internal compartment 3 therein and includes an opening 3a for accessing the internal compartment 3.

[0032] The battery cell further comprises electrodes (cathode and anode, not shown), which are housed in an internal compartment 3 along with a separator material (not shown) and an electrolyte (not shown).

[0033] The electrode and separator material are inserted into the internal compartment 3 through the opening 3a.

[0034] Therefore, the lid assembly 1 is configured to be coupled to the housing 2 at the opening 3a to fluidly close the internal compartment 3 as needed during normal use of the battery cell.

[0035] Therefore, the battery cell comprises a housing 2 having electrodes, a separator, and an electrolyte, and a lid assembly 1.

[0036] According to the illustrated embodiment, the housing 2 has a parallelepiped shape. However, the housing 2 may have any angular shape, such as a cube or a triangular base.

[0037] In one embodiment, the housing 2 may be cylindrical.

[0038] This invention refers to prismatic battery cells, but does not lose generality.

[0039] In particular, the present invention refers to battery cells used in the automotive industry, for example, in battery modules for hybrid or all-electric vehicles, but without loss of generality.

[0040] Referring to Figures 1 and 2, the lid assembly 1 is essentially, A base plate 4, made of a metal material, preferably aluminum, is configured to close the opening 3a of the internal compartment 3, that is, to match the shape of the opening 3a and to engage with the opening 3a. A current collector 5, which can be electrically connected to each electrode, collects electrical energy from each electrode of the battery cell in the internal compartment 3 and transmits it out of the internal compartment 3. A terminal 6 is electrically coupled to the collector 5 to receive electrical energy from the collector 5 and is configured to receive a connector (not shown) of a consumer device (not shown) to be powered by a battery cell, It is equipped with.

[0041] The collector 5 comprises a plate body 7 for electrically connecting to each electrode, and pins 8 having a substantially cylindrical shape and preferably protruding orthogonally from the plate body 7.

[0042] The base plate 4 has a through hole 4a, an inner wall 4b configured to face the internal compartment 3 (see Figure 2 in the assembled state), and an outer wall 4c located on the opposite side of the inner wall 4b and configured to face the external environment.

[0043] The pin 8 engages with the through hole 4a such that it protrudes perpendicularly from the outer wall 4c, and the surface 7a of the plate body 7 from which the pin 8 protrudes faces the inner wall 4b (Figure 2).

[0044] Terminal 6 is mechanically coupled to pin 8 to establish the aforementioned electrical connection.

[0045] In detail, the terminal 6 has a through hole 6a that is engaged by a pin 8 until the terminal 6 is placed on the outer wall 4c, and conveniently an electrical insulating gasket 10 is interposed so that the terminal 6 and the base plate 4 are electrically insulated from each other. Appropriately, the gasket 10 also has a through hole 10a.

[0046] Pin 8 extends along axis A, and through holes 4a, 6a, and 10a are coaxial with pin 8 for convenience.

[0047] Therefore, terminal 6 faces outward and is ready to receive the aforementioned connector, and is electrically insulated from the base plate 4 (by gasket 10) to avoid current dispersion or short circuits.

[0048] Conveniently, lid assembly 1 is A stop frame 11 made of an electrically insulating material (e.g., rigid plastic), which is known in itself and will not be described in detail, An injection opening 13a provided in the base plate 4, through which the electrolyte is inserted, A cap 13b for closing the injection opening 13a, To further prepare.

[0049] The lid assembly 1 further includes a sealing element 14 mechanically interposed between the collector 5 and the base plate 4 to electrically insulate the collector 5 and the base plate 4 from each other and to fluidly seal the internal compartment 3 from the external environment.

[0050] In detail, the sealing element 14 is configured to prevent the electrolyte from leaking out of the internal compartment 3 and / or the unwanted intrusion of external impurities (generally dust, sand, and dirt) into the internal compartment 3.

[0051] Preferably, the sealing element 14 is made of an elastomer material such as EPDM rubber, FKM rubber, HNBR rubber, NBR rubber, or other similar materials.

[0052] Figure 1 shows the lid assembly 1 in an exploded view, while Figure 2 shows the assembled state, i.e., the lid assembly 1 in use, with all the parts above connected to each other and to the housing 2.

[0053] In Figure 1, only one top opening 3a of the housing 2 is shown.

[0054] However, the housing 2 may have more than one opening 3a, for example, a top opening 3a and a bottom opening 3b (not shown in Figure 1) opposite to opening 3a. The opening 3b is configured to be closed by a further lid assembly (not shown) substantially corresponding to lid assembly 1.

[0055] In particular, a cover assembly is provided for each electrode, and each terminal 6 is connected to one of the cathode and anode.

[0056] Alternatively, openings 3a and 3b can define lateral openings in the housing 2.

[0057] In another embodiment not shown, the housing 2 has only a single opening. In this case, the lid assembly has a single base plate 4 but has two terminals 6, two collectors 5, and two sealing elements 14, corresponding to the respective electrodes.

[0058] Next, let's discuss seal element 14.

[0059] The sealing element 14, in its assembled state (as seen in Figures 2 and 3), has a central axis B that is coaxial with axis A, and exhibits a substantially L-shaped semi-contour with respect to axis B.

[0060] More specifically, the resulting cross-section of the seal element 14 is two L-shaped semi-contours that are radially opposite to each other with respect to axis B.

[0061] The sealing element 14 is (Figures 3 and 4), An axial collar 15 extends in an annular shape around axis B and is configured to electrically insulate the collector 5 from the base plate 4, A radial sealing portion 16 is configured to protrude cantilevered from the collar 15 and to fluid-tightly seal the internal compartment 3 from the external environment, It is equipped with.

[0062] Preferably, the collar 15 and the sealing portion 16 are formed integrally without any continuous breaks.

[0063] Conveniently, the sealing portion 16 also performs the function of an electrical insulator, and the collar 15 also performs the function of a sealing element.

[0064] In particular, with respect to the sealing function of the sealing element 14, the sealing portion 16 is mostly fitted to prevent the electrolyte from leaking out of the internal compartment 3, and the collar 15 is mostly fitted to prevent the unwanted intrusion of external impurities into the internal compartment 3.

[0065] In particular, as shown in Figure 3, the sealing element 14 should be mounted on the collector 5 such that the pin 8 engages with the collar 15 in the axial direction, the collar 15 surrounds the pin 8 at least partially, and the sealing portion 16 rests on the plate body 7 (in the axial direction).

[0066] More specifically, the sealing portion 16 is placed (axially) on the surface 7a of the plate body 7 and, during use and in the assembled state, is interposed and compressed between the surface 7a and the inner wall 4b in the axial direction, so that the base plate 4 and the collector 5 are joined to each other via the sealing portion 16 without contact (i.e., touching) with each other.

[0067] Advantageously, the sealing portion 16 comprises a main body 17 and a projection or raised portion 18 extending from the main body 17 and defining the free end of the sealing portion 16, wherein the raised portion 18 has an axial size larger than the axial size of the main body 17.

[0068] In detail, the sealing portion 16 extends radially outward with respect to the axis B. The main body 17 extends in an annular shape around the axis B and is attached to the collar 15. The raised portion 18 is attached to the main body 17 and is positioned radially outward relative to the axis B compared to the main body 17.

[0069] More specifically, the collar 15 has a first axial end 15a configured to face the internal compartment 3 when the lid assembly 1 is in use and assembled, and a second axial end 15b opposite to the first axial end 15a.

[0070] The sealing portion 16 is attached to the first axial end 15a and cantilevered outwards radially from the first axial end 15a.

[0071] Preferably, the raised portion 18 extends continuously in an annular shape around axis B.

[0072] Conveniently, the raised portion 18 has a substantially circular contour.

[0073] More specifically, the raised portion 18 defines the O-ring shape of the sealing portion 16.

[0074] The terms "contour" or "semi-contour" explicitly indicate that a cross-section of the relevant part or component is intended.

[0075] Since the raised portion 18 has an axial size larger than the axial size of the main body 17, the raised portion 18 is compressed between the base plate 4 and the collector 5 when the lid assembly 1 is in use and in its assembled state, while the main body 17 is left substantially uncompressed.

[0076] The applicant observed that such a configuration ensures more effective sealing of the internal compartment 3, particularly over long periods. As is known, during the use of a battery cell, pressure can rise within the internal compartment 3, in which case the plate body 7 of the collector 5 is increasingly pressed toward the base plate 4 and therefore toward the sealing portion 16. Through extensive experimental activity, the applicant observed that, thanks to the unique shape of the sealing element 14, stress concentrates in the raised portion 18, while the main body 17 remains substantially unstressed and undeformed, resulting in increased sealing efficiency and reduced risk of electrical contact between the collector 5 and the base plate 4.

[0077] In addition, the presence of the raised portion 18 according to the present invention minimizes the risk of the base plate 4 and the collector 5 coming into contact in the axial direction.

[0078] Advantageously, the sealing element 14 includes a second projection or protrusion 19 located at the first axial end 15a of the collar 15, radially opposite to the protrusion 18.

[0079] In particular, the main body 17 is interposed between the raised portion 18 and the second raised portion 19 in the radial direction with respect to axis B.

[0080] More specifically, the second protrusion 19 projects axially from the first axial end 15a, extends continuously in an annular shape around axis B, and defines a projection of the collar 15 with a curved contour.

[0081] More specifically, the second protrusion 19 partially defines an O-ring shape.

[0082] Preferably, the second protrusion 19 has a radial size smaller than the radial size of the protrusion 18 with respect to axis B.

[0083] Conveniently, the second protrusion 19 has an axial size larger than the axial size of the main body 17 with respect to axis B.

[0084] Through extensive experimental activities, the applicant observed that the presence of the second ridge 19, as described above, increases the rigidity of the sealing element 14, and in particular the sealing portion 16, resulting in better distribution of stress caused by axial compression of the sealing element 14. Such stress is largely supported and absorbed by the ridge 18 and the second ridge 19, with the second ridge 19 acting as a support to suppress excessive bending movement of the sealing portion 16 and the collar 15. Since the ridge 18 is the thickest part of the sealing portion 16, this results in reduced wear of the sealing portion 16.

[0085] Therefore, the sealing effect becomes even more effective thanks to the second protrusion 19. Electrical insulation also benefits from the presence of the second protrusion 19.

[0086] Furthermore, due to the presence of the aforementioned raised portion 18 and the second raised portion 19, when the sealing element 14 is compressed between the base plate 4 and the collector 5 and / or subjected to operating stress, the collar 15 bends radially outward.

[0087] In detail, the second axial end 15b is bent outward, while the first axial end 15a is bent toward the pin 8 and contacts the pin 8 more.

[0088] This increases the safety of the lid assembly 1, as the collector pin 8 and the base plate 4 are at a sufficient distance from each other.

[0089] Furthermore, the centering of the sealing element 14 is further improved.

[0090] Ultimately, as a result of the unique shape of the sealing element 14 according to the present invention, sealing and electrical insulation are more effective than known sealing elements (both O-ring type and L-shaped type), and the lifespan of the sealing element 14 itself is also increased due to better stress management.

[0091] Conveniently, color 15 is mounted on pin 8 with radial interference.

[0092] The applicant recognized that this resulted in better centering of the sealing element 14 with respect to axis A, and that, in particular, combined with the presence of the second protrusion 19, further increased the rigidity of the sealing element 14 against deformation.

[0093] In one embodiment, the pin 8 is welded to the plate body 7 by a weld seam (not shown).

[0094] In one embodiment, the collector 5 has a rib (not shown) at the joint between the pin 8 and the plate body 7, and the rib serves to reinforce the collector 5.

[0095] Advantageously, the sealing element 14 further comprises a first annular groove 20 provided at the first axial end 15a of the collar 15.

[0096] Preferably, the groove 20 extends continuously in an annular shape around axis B.

[0097] The groove 20 is configured to receive the aforementioned weld seam (also known as the "overmetal") or the aforementioned rib.

[0098] Thus, the sealing element 14 adapts to the shape and / or structural imperfections of the lid assembly 1 (and especially the collector 5), resulting in good fit and / or fixation of the sealing element 14 to the collector 5. Furthermore, stress is reduced thanks to the fact that the shape of the sealing element 14 takes into account the shape of the collector 5. As a result, good sealing and electrical insulation performance is ultimately achieved.

[0099] Figure 5 shows a sealing element 14' according to a different embodiment of the present invention.

[0100] Since seal element 14' is similar to seal element 14, we will use the same reference number for equal or corresponding parts and only describe the differences between the two below.

[0101] In particular, the sealing element 14' further comprises a second annular groove 21 provided at the second axial end 15b of the collar 15.

[0102] Preferably, the groove 21 extends continuously in an annular shape around axis B.

[0103] The groove 21 is configured to receive the corresponding (radial) rib (not shown) of the base plate 4.

[0104] In this way, the sealing element 14' can be fixed to the base plate 4 more effectively and stably, thereby maintaining its position even when subjected to internal stress (e.g., due to increased pressure) or external force (e.g., vibration).

[0105] Conveniently, the sealing element 14' is provided with the first groove 20 of the type described above.

[0106] In the illustrated embodiment, the presence of the groove 21 provides sufficient rigidity to the sealing element 14', so the sealing element 14' does not have a second protrusion 19. Therefore, material can be saved during manufacturing.

[0107] The advantages of the sealing elements 14, 14' according to the present invention, and of the lid assembly 1 on which such sealing elements are implemented, will become apparent from the above description.

[0108] As a result of the unique shape of the sealing elements 14 and 14' according to the present invention, the sealing of the internal compartment 3 becomes more effective, electrical insulation between the base plate 4 and the collector 5 becomes more effective, and the lifespan of the sealing elements 14 and 14' themselves is increased due to better stress management.

[0109] In particular, the applicant observed through extensive stress-strain analysis activities that the sealing elements 14, 14' have no weak points when subjected to forces that typically occur during use of the lid assembly 1 in a battery cell. More specifically, it was recognized that most of the stress is absorbed and withstood by the raised portion 18, but the most important point, the outer joint between the sealing portion 16 and the collar 15, remains relatively stress-free.

[0110] Furthermore, thanks to the aforementioned protrusions 18, and also, if present, the second protrusions 19, the seal elements 14, 14' provide better tolerance compensation, as better and more robust compression is possible, taking into account fluctuations in operating conditions such as temperature and pressure.

[0111] In addition, through extensive experimental activities, the applicant observed that the unique shape of the sealing elements 14, 14' resulted in a significant reduction in axial stress (due to compression between the collector 5 and the base plate 4).

[0112] Clearly, modifications can be made to the sealing elements 14, 14' as described herein without departing from the scope of protection as defined in the appended claims. [Explanation of symbols]

[0113] 1. Lid Assembly 2 cabinets 3. Internal Compartments 3a Top opening 3b Bottom opening 4 Base Plate 4a through hole 4b Inner wall 4c exterior wall 5 Collector 6 terminals 6a Through hole 7 Plate bodies 7a surface 8 pins 10 Gaskets 10a through hole 11 Stop Frames 13a Injection opening 13b cap 14 Seal elements 14' Seal element 15 colors 15a First axial end 15b Second axial end 16 Sealing part 17 Main unit 18 Ridge 19. Second raised area 20 First annular groove 21 Second annular groove

Claims

1. A sealing element (14, 14') for a lid assembly (1) suitable for fluid-tightly closing the internal compartment (3) of a rectangular battery cell, wherein the sealing element (14, 14') is interposed between the current collector (5) of the lid assembly (1) and the base plate (4) of the lid assembly (1) to electrically insulate the current collector (5) and the lid assembly (1) from each other and to fluid-tightly seal the internal compartment (3), wherein the sealing element (14, 14') has a central axis (B) and exhibits a substantially L-shaped semi-contour with respect to the central axis (B), and the sealing element (14, 14') is, An axial collar (15) extends in an annular shape around the central axis (B) and is configured to electrically insulate the current collector (5) from the base plate (4), A radial sealing portion (16) is configured to protrude cantilevered from the axial collar (15) and to fluidly seal the internal compartment (3), Equipped with, The radial sealing portion (16) comprises a main body (17) and a projection or raised portion (18) extending from the main body (17) and defining the free end of the radial sealing portion (16), wherein the projection or raised portion (18) has an axial size larger than the axial size of the main body (17), and is a sealing element (14, 14').

2. The sealing element according to claim 1, wherein the radial sealing portion (16) extends radially outward with respect to the central axis (B), the main body (17) extends annularly around the central axis (B) and is attached to the axial collar (15), and the protruding portion or raised portion (18) is attached to the main body (17) and is positioned radially outward with respect to the central axis (B) from the main body (17).

3. The axial collar (15) has a first axial end (15a) configured to face the internal compartment (3) when in use and in the assembled state, and a second axial end (15b) opposite to the first axial end (15a). The sealing element according to claim 1 or 2, wherein the radial sealing portion (16) is attached to the first axial end (15a) and protrudes radially in a cantilevered manner from the first axial end (15a).

4. The sealing element (14, 14') according to claim 3, comprising a first annular groove (20) provided at the first axial end (15a) of the axial collar (15), wherein the first annular groove (20) is configured to receive the weld seam of the current collector (5) or the rib of the current collector (5).

5. The sealing element (14') according to claim 3 or 4, comprising a second annular groove (21) provided at the second axial end (15b) of the axial collar (15), wherein the second annular groove (21) is configured to receive a corresponding rib of the base plate (4).

6. The sealing element according to claim 3 or 4, further comprising a second projection or protrusion (19) positioned radially opposite to the projection or protrusion (18) at the first axial end (15a) of the axial collar (15), wherein the main body (17) is interposed radially between the projection or protrusion (18) and the second projection or protrusion (19).

7. The sealing element according to claim 6, wherein the second projection or protrusion (19) protrudes axially from the first axial end (15a), extends in an annular manner around the central axis (B), and defines a projection of the axial collar (15) having a curved contour.

8. The second projection or protrusion (19) has a radial size smaller than the radial size of the projection or protrusion (18), The sealing element according to claim 6 or 7, wherein the second projection or protrusion (19) has an axial size larger than the axial size of the main body (17).

9. The sealing element according to any one of claims 1 to 8, wherein the protruding or raised portion (18) extends in an annular manner around the central axis (B) and has a substantially circular contour.

10. The sealing element according to claim 9, wherein the protruding or raised portion (18) defines the O-ring shape of the radial sealing portion (16).

11. A lid assembly (1) for a rectangular battery cell having a housing (2) that defines an internal compartment (3) inside, and at least one opening (3a) for accessing the internal compartment (3), A base plate (4) for closing the opening (3a) of the internal compartment (3), To collect electrical energy and transmit it out of the internal compartment (3), at least one current collector (5) that can be electrically connected to each electrode of the rectangular battery cell in the internal compartment (3), At least one terminal (6) electrically coupled to the current collector (5) in order to receive the electrical energy from the current collector (5), A sealing element (14, 14') according to any one of claims 1 to 10, wherein the sealing element (14, 14') is mechanically interposed between the current collector (5) and the base plate (4) for electrically insulating the current collector (5) and the base plate (4) from each other and for fluid-tight sealing the internal compartment (3) from the external environment, A lid assembly (1) comprising:

12. The current collector (5) comprises a plate body (7) for electrically connecting to each of the electrodes, and a pin (8) extending along the central axis (B) and protruding from the plate body (7). The lid assembly according to claim 11, wherein the sealing elements (14, 14') are mounted on the current collector (5) such that the pin (8) engages axially with the axial collar (15), the axial collar (15) at least partially surrounds the pin (8), and the radial sealing portion (16) rests on the plate body (7).

13. The lid assembly according to claim 12, wherein the axial collar (15) is mounted on the pin (8) by radial interference fit.

14. The base plate (4) has a through hole (4a), The pin (8) engages with the through hole (4a), and the surface (7a) of the plate body (7) from which the pin (8) protrudes faces the inner wall (4b) of the base plate (4), which is configured to face the internal compartment (3). The lid assembly according to claim 12 or 13, wherein the radial sealing portion (16) of the sealing element (14, 14') is placed on the surface (7a) and is interposed and compressed between the surface (7a) and the inner wall (4b) in the axial direction, so that the base plate (4) and the current collector (5) are coupled to each other via the radial sealing portion (16) without contact with each other.

15. The sealing element (14) is as described in claim 4, The pin (8) is welded to the plate body (7) by a weld seam, and the first annular groove (20) is configured to receive the weld seam, or The current collector (5) has ribs, and the ribs are configured to engage with the first annular groove (20). The lid assembly according to any one of claims 11 to 14.

16. The lid assembly according to any one of claims 11 to 14, wherein the sealing element (14') is as described in claim 5, and the base plate (4) has ribs, the ribs are configured to engage with the second annular groove (21).

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