Cap assembly for prismatic battery cells

Abstract

The invention relates to a cover assembly for a prismatic battery cell, comprising a metal frame designed to be fixed on a housing of a prismatic battery cell. The cover assembly further comprises a base plate of electrically insulating plastic, which is arranged within the metal frame and forms a form-fit and / or force-fit connection with the metal frame, and comprises at least one first insert, wherein the first insert is form-fit fixed on the base plate and is an electrode feedthrough.

Description

Technical Field

[0001] The present invention relates to a cover assembly for a prismatic battery cell, a cover assembly device, a prismatic battery cell, and a method for manufacturing a cover assembly. Background Technology

[0002] Prismatic battery cells are used, for example, in rechargeable lithium-ion batteries, sodium-ion batteries, or supercapacitors. A prismatic battery cell typically includes a casing made of aluminum and a cover assembly disposed on the casing. The cover assembly is used to enclose and seal the battery casing, thereby protecting the battery cell's chemicals from the surrounding environment. The cover assembly should also prevent the ingress of interfering substances such as oxygen or water. The cover assembly should also enable electrode connections inside the battery cell and electrical contacts on the outside of the battery cell. It is necessary to electrically insulate the electrical connections within the cover assembly from each other. To achieve these objectives, the cover assembly is often a complex assembly composed of multiple parts. Summary of the Invention

[0003] The object of the present invention is to provide an improved cover assembly, an improved cover assembly device, an improved prismatic battery cell, and an improved method of manufacturing the cover assembly, while achieving simple and low-cost manufacturing.

[0004] The solution of the present invention to achieve the above-mentioned objective lies in a cover assembly having the features of claim 1, a cover assembly device having the features of claim 13, a prismatic battery cell having the features of claim 14, and a method of manufacturing a cover assembly having the features of claim 15.

[0005] The dependent claims disclose preferred improvements to the invention.

[0006] The cover assembly of the present invention, having the features of claim 1, includes a metal frame designed to be fixed to the housing of the prismatic battery cell. The cover assembly further includes a substrate made of electrically insulating plastic, disposed on the metal frame and forming a form-fit, material-fit, and / or force-fit connection with the metal frame. Preferably, the form-fit connection has a toothed pattern to improve the mechanical strength and sealing properties of the connection. The electrically insulating plastic can be a material selected from thermoplastic, elastomer, thermosetting plastic, or thermoplastic elastomer. The electrically insulating plastic is particularly made of PPS, PPA, PBT, LCP (Liquid Crystal Polymer), EPDM, or PP. The cover assembly further includes at least one first insert, wherein the first insert is fixed to the substrate by a form-fit, material-fit, and / or force-fit manner. The first insert is a conductive electrode feeder.

[0007] Preferably, the cover assembly includes one electrode feeder serving as an anode and another electrode feeder serving as a cathode. The cathode is preferably made of aluminum, and the anode is preferably made of copper, aluminum, or both metals. The structure of this invention enables simple and low-cost manufacturing of the cover assembly while simultaneously achieving reliable sealing of the prismatic battery cell. Integrating the insert into the substrate allows for easy integration of additional functions. The integrated structure of the cover assembly also reduces the difficulty of installation. Another advantage is that the substrate can compensate for tolerances in the frame or insert during manufacturing. The metal frame provides an interface for easy welding of the cover assembly to the prismatic battery cell, especially when the metal of the frame is the same as the metal of the battery cell casing. Based on the substrate made of electrically insulating plastic, there is no need to add an internal insulating plate. This significantly increases the usable space within the battery cell, thereby increasing the battery cell capacity without changing its external dimensions.

[0008] Preferably, the electrode feed element is a plate component with a U-shaped cross-section, the U-shaped cross-section being coplanar with the substrate. The U-shaped cross-section of the electrode feed element is easy to manufacture. A reliable form-fit connection can be established by allowing the electrically insulating plastic of the substrate to flow from the back side through the U-shaped cross-section. The exposed inward and outward sides of the U-shaped cross-section achieve good contact of the cover assembly.

[0009] More preferably, a tenon-and-groove joint, a dovetail joint, or a meshing tooth system is formed between the electrode feed member and the substrate. These connections are easy to manufacture and constitute a reliable connection. Other embodiments of the electrode feed member are rod-shaped parts cut to length, deep-drawn parts, forgings, and die-cast parts.

[0010] Another sealing element may be provided between the electrode polelement and the substrate to seal the interface between the electrode feed element and the substrate. This is particularly important when there are temperature differences during the operation of the battery cell; in this case, the sealing element compensates for the different thermal expansion of the two materials. The sealing element can be implemented by injection molding the electrode feed element, or it can be placed as a separate element and injection molded together during the installation of the substrate.

[0011] Preferably, the plastic of the substrate is a thermoplastic, an elastomer, a thermosetting plastic, or a thermoplastic elastomer.

[0012] The cover assembly preferably also includes a bursting zone. In the event of cell failure, the bursting zone can open under temperature and, particularly, pressure, allowing gaseous and particulate degradation products released from the prismatic cell during thermal runaway to exit the prismatic cell and be directionally and controlledly discharged. For this purpose, a defined mechanically and thermally weak point is preferably introduced into the bursting zone. The bursting zone is easily integrated into the cover assembly, thereby reducing the manufacturing workload of the prismatic cell casing.

[0013] Preferably, the bursting region is located in the substrate as a second insert, or integrated into the substrate by reducing the wall thickness. By directly integrating the bursting region into the substrate using a reduced wall thickness, simple and low-cost integration can be achieved without adding other components or other installation steps. Implementing the bursting region as a second insert also achieves simple integration into the substrate and also provides flexibility in the design of the bursting region.

[0014] In another preferred embodiment, the cover assembly includes a first burst region and a second burst region, wherein the compressive strength of the second burst region is higher than that of the first burst region. When a battery cell begins to fail, the prismatic battery cell can release gas via the first burst region. These gases can be detected by corresponding sensing mechanisms. This provides operators of the prismatic battery cells with significantly extended time to respond to impending thermal runaway and its propagation to adjacent battery cells. The second burst region preferably provides a significantly larger opening for targeted release of combustion gases and for guiding the combustion gases in a defined manner to an area that causes only minor damage and, ideally, does not affect other battery cells. The multi-stage burst region can be achieved through a single opening with a stepped cross-section. Alternatively, the first and second burst regions can be partially separated from each other on the cover assembly.

[0015] The substrate preferably includes a reinforcing structure. The reinforcing structure is preferably a rib, which is arranged adjacent to the burst region to define the direction of outflow from the burst region. The rib reinforces both the substrate and the cover assembly. By placing the rib between the electrode feeder and the burst region, electrical components, particularly connecting strips, are also protected from conductive particles released from the burst region in the event of cell failure.

[0016] More preferably, the metal frame is constructed as a stamped part, a die-cast part, or a formed profile. By implementing it as a stamped part, the frame can be manufactured at low cost while achieving high mechanical strength, without the need for butt joints. Implementing it as a stamped part also allows for easy integration of reinforcing ribs. Implementing it as a formed profile enables the creation of metal frames with customized cross-sections, thereby forming reliable form-fit connections, for example, between the metal frame and the substrate. Implementing it as a die-cast part further reduces waste generated during manufacturing, and this waste can be reconstituted into melt. In this case, reinforcing elements (e.g., honeycomb structures) can also be well incorporated. Corner radii can also be much smaller than those of stamped bent parts.

[0017] According to another preferred embodiment of the invention, the substrate includes a permeation-reducing coating. This prevents gas from permeating into or out of the prismatic battery cells via the cover assembly. Preferably, the permeation-reducing coating is disposed on the outer or inner side of the cover assembly. When the cover assembly uses an internal coating, it is necessary to ensure that the permeation-reducing coating has electrolyte tolerance. Possible embodiments of the permeation-reducing coating are coatings made of SiO2, EVOH, or metal. In the case of metal coatings, the permeation-reducing coating is preferably spaced at least 2 mm from the electrode feed element.

[0018] The substrate of the cover assembly preferably has at least one injection port. Particularly preferably, the substrate has two injection ports. Electrolytes can be injected into the prismatic battery cells through the injection ports. By providing a second injection port, the gas displaced by the electrolyte can be more easily extracted, thereby accelerating the filling process. Preferably, the injection ports are designed to be sealed with plugs. Particularly preferably, the plugs are designed to be welded to the cover assembly after the battery cells have been filled.

[0019] More preferably, the injection port is implemented as a third insert. Thus, the injection port can be designed flexibly and independently of the substrate, and easily integrated into the substrate. By arranging the injection port in a substrate made of electrically insulating plastic, contaminants composed of conductive particles can be prevented from entering the battery cell during the final soldering of the battery cell.

[0020] The present invention also describes a cover assembly device comprising a first cover assembly and a second cover assembly. The electrode feed of the first cover assembly is an anode, and the electrode feed of the second cover assembly is a cathode. Furthermore, the first and second cover assemblies are designed to be fixed to opposite ends of a prismatic battery cell. Thus, the electrical connections of the prismatic battery cell can be located at two opposite ends, thereby simplifying current conduction. The cover assembly device also enables the application of, for example, extruded housing profiles, which can be closed at both open ends by the cover assembly device in a simple and low-cost manner.

[0021] The present invention also describes a prismatic battery cell, which includes a housing, an energy storage device, and the aforementioned cover assembly or cover assembly device.

[0022] The present invention also relates to a method for manufacturing a cover assembly for a prismatic battery cell. The method includes the step of arranging a metal frame and a first insert (which is an electrode feed member) opposite to each other. Subsequently, a substrate is manufactured on the metal frame and the first insert using an electrically insulating plastic through an injection molding process, such that a form-fit, material-fit, and / or force-fit connection is formed between the substrate and the metal frame, and a form-fit connection is formed between the first insert and the substrate. The electrically insulating plastic is preferably a thermoplastic or an elastomer.

[0023] More preferably, in the method of manufacturing the cover assembly, a second insert including a bursting region and / or a third insert including an injection port are connected to the substrate during the injection molding process. This allows all inserts to be integrated into the cover assembly in a single injection molding process, eliminating complex installation steps.

[0024] Particularly preferably, in the method of manufacturing the cover assembly, the bursting region is integrally placed into the substrate through the injection molding process. By directly integrating the bursting region into the substrate using injection molding, no additional components are required.

[0025] Particularly preferably, the injection port is also integrally placed into the substrate in the method of manufacturing the cover assembly. Attached Figure Description

[0026] Further details, advantages, and features of the present invention are described below with reference to the accompanying drawings. Wherein: Figure 1 A schematic cross-sectional view of a prismatic battery cell having a cover assembly according to the first embodiment. Figure 2 This is a schematic top view of the cover assembly according to the first embodiment. Figure 3This is a detailed schematic diagram of the cover assembly according to the first embodiment in the transition region of the casing of the prismatic battery cell. Figures 4a-f illustrate further alternative solutions for the connection between the first insert and the substrate, and Figure 5 This is a schematic diagram of a prismatic battery cell having a first cover assembly and a second cover assembly according to the second embodiment. Detailed Implementation

[0027] The following reference Figures 1 to 3 The cover assembly 1 and the method of manufacturing the cover assembly 1 according to the first embodiment of the present invention will be described in detail.

[0028] Figure 1 This is a cross-sectional view of the longitudinal plane of the prismatic battery cell 3. The prismatic battery cell 3 includes a housing 2, which is closed on the top side by a cover assembly 1. An energy storage device 4 is provided inside the housing 2.

[0029] The energy storage device 4 includes at least one negative electrode 7 and a positive electrode 8 surrounded by an electrolyte 9. The energy storage device 4 may be, for example, a lithium-ion battery, a sodium-ion battery, or a supercapacitor.

[0030] Figure 1 The cover assembly 1 has a metal frame 11, which is fixed to the housing 2 of the prismatic battery cell 3 by welding connection 27. The housing 2 preferably has a wall thickness of 0.3-1.0 mm and is made of aluminum.

[0031] A substrate 12 made of electrically insulating plastic is disposed within a metal frame 11. A form-fitting connection is formed between the substrate 12 and the metal frame 11.

[0032] The cover assembly 1 includes two electrode feeders 21, two injection ports 24, and a bursting region 22 comprising a first bursting region 22a and a second bursting region 22b. The two electrode feeders 21 are implemented as first inserts 31, the two injection ports 24 are implemented as third inserts 33, and the bursting region 22 is implemented as a second insert 32. These inserts are encapsulated by injection molding of an electrically insulating plastic onto the substrate 12. Based on the outer contours of the inserts 31, 32, and 33, a form-fitting connection can be formed between the substrate 12 and the inserts 31, 32, and 33.

[0033] The electrode feed member 21 has a U-shaped cross-section, wherein the electrically insulating plastic of the substrate 12 flows between the two sides of the U-shaped cross-section, thereby forming a form-fit connection. The U-shaped cross-section is coplanar with the substrate 12. One outer side of the U-shaped cross-section of the electrode feed member 21 faces the inner cavity of the prismatic battery cell 3. One electrode feed member 21 is connected to the negative electrode 7, thereby forming the anode 25, and the other electrode feed member 21 is connected to the positive electrode 8, thereby forming the cathode 26. The other outer side of the U-shaped cross-section of the electrode feed member 21 faces outward and is designed to contact an electrical conductor.

[0034] Electrode feeders 21 are disposed at two side ends near the metal frame 11 along the longitudinal direction R1. The distance between the electrode feeders 21 and the metal frame 11 must be large enough to prevent voltage breakdown between the electrode feeders 21 and the housing.

[0035] A bursting zone 22 is located at the center of the cover assembly 1. The bursting zone 22 has a stepped structure, forming a first bursting zone 22a and a second bursting zone 22b. The thickness of the first bursting zone 22a is less than that of the second bursting zone 22b. Therefore, the compressive strength of the first bursting zone 22a is lower than that of the second bursting zone 22b, causing the first bursting zone 22a to open first in the event of battery cell failure, thereby releasing the increased pressure from the interior of the prismatic battery cell. Subsequently, when the pressure inside the prismatic battery cell further increases, the second bursting zone 22b can open. The first bursting zone 22a is located within the second bursting zone 22b, and a notch is formed between the first bursting zone 22a and the second bursting zone 22b, constituting a defined failure site. A notch is also formed at the outer edge of the second bursting zone 22b, constituting a defined failure site for the second bursting zone 22b.

[0036] Ribs 13 are formed between the blasting region 22 and the electrode feed member 21, respectively. Ribs 13 are part of the substrate 12 and perpendicular to the substrate, and define the direction of flow out from the blasting region 22.

[0037] Between the two ribs 13 and the two electrode feed members 21, injection ports 24 are respectively provided in the substrate 12. One injection port 24 is used to feed the electrolyte 9 into the prismatic battery cell 3, and the other injection port 24 is used to expel the gas displaced by the electrolyte 9. For this purpose, these injection ports 24 have cylindrical through holes, which are designed to be sealed by plugs.

[0038] A coating 23 that reduces gas permeation is applied to the outer side of the substrate 12 of the cover assembly 1, which is perpendicular to the transverse R2, to prevent gas exchange between the energy storage device 4 and the external environment of the prismatic battery cell 3 in the filled prismatic battery cell 3.

[0039] The cover assembly 1 according to the first embodiment is manufactured by injection molding. To this end, in a first step, a metal frame 11, a first insert 31, a second insert 32, and a third insert 33 are placed into an injection mold, aligned, and fixed. Finally, electrically insulating plastic is fed into the mold, wherein the plastic comes into contact with and solidifies with the metal frame 11 and the inserts 31, 32, and 33. The solidified plastic forms a substrate, which is connected to the metal frame 11 and the inserts 31, 32, and 33 through form-fitting and / or force-fitting connections.

[0040] Figure 2 for Figure 1 A top view of the cover assembly 1 of the prismatic battery cell 3.

[0041] The metal frame 11 is rectangular and forms the outer edge of the cover assembly 1. The substrate 12 is disposed within the frame, and a coating 23 for reducing gas permeation is applied to the substrate.

[0042] The electrode feeder 21, injection port 24, and blasting zone 22 are centrally located along the longitudinal axis XX. The inserts 31, 32, and 33 are spaced a certain distance from the metal frame 11. The blasting zone 22 is elliptical in the top view.

[0043] Rib 13 extends from one side of metal frame 11 to the opposite side of metal frame 11. Rib 13 is perpendicular to longitudinal axis XX.

[0044] Figure 3 for Figure 1 A detailed view of the prismatic battery cell 3 in the transition area between the cover assembly 1 and the housing 2.

[0045] In such Figure 3 In the first embodiment shown, the metal frame 11 is implemented as a molded profile. A portion of the metal frame 11 is disposed in the substrate 12.

[0046] The metal frame 11 has a three-bend profile in its cross-section, creating an undercut 11a. The undercut 11a forms a form-fit connection between the metal frame 11 and the substrate 12 in the longitudinal direction R1 and the transverse direction R2, thereby achieving a stable connection with high sealing performance. The metal frame 11 also forms upper and side stops, which are designed to contact the housing 2.

[0047] The outer end of the metal frame 11, which is not located in the substrate 12, is connected to the housing 2 of the prismatic battery cell 3 via welding connection 27 in a material-fit manner. Thus, the housing 2 and the cover assembly form a closed unit that prevents the electrolyte 9 from flowing out.

[0048] Figures 4a-f illustrate different alternative connections between the first insert 31 and the substrate 12. The connections between the substrate 12 and the second insert 32 and / or the third insert 33 may employ the same or different implementations.

[0049] Figure 4a illustrates a connection in which the first insert 31 has a bolt at the center of its side end. During manufacturing, the electrically insulating plastic of the substrate 12 flows around the bolt, such that the substrate has a U-shaped cross-section in the connection area, with the bolt positioned at the center of this cross-section, thus forming a form-fit connection in the transverse direction R2.

[0050] Figure 4b illustrates another alternative to the connection, wherein the first insert 31 has a groove at the center of its side end. During manufacturing, electrically insulating plastic from the substrate 12 flows into the groove, thereby creating a form-fit connection between the insert and the substrate 12 in the transverse direction R2.

[0051] Figure 4c shows an alternative connection between the first insert 31 and the substrate 12, which adopts a dovetail joint. The first insert 31 has a dovetail groove into which the plastic of the substrate flows during manufacturing, thereby forming a form-fitting connection in the transverse direction R2 and the longitudinal direction R1.

[0052] Figure 4d illustrates another alternative connection between the first insert 31 and the substrate 12. In this alternative, the first insert 31 has a stepped portion at one end along the longitudinal direction R1. The substrate 12 forms an opposite stepped portion, thereby creating a form-fit connection towards the cover assembly.

[0053] Figure 4e illustrates another alternative to the stepped connection between the first insert 31 and the substrate 12. In this design, the stepped portion has an indentation 11a in the longitudinal direction R1, thereby additionally achieving a form fit in the longitudinal direction R1.

[0054] Figure 4f shows another alternative connection between the first insert 31 and the substrate 12. In this alternative, the first insert 31 has a groove at its outer end along the longitudinal direction R1. The side of the groove perpendicular to the transverse direction R2 has a toothed surface, thus creating an additional connection along the longitudinal direction R1 that conforms to the shape of the substrate, compared to the connection shown in Figure 4b.

[0055] Figure 5 A second embodiment of a prismatic battery cell 3 is shown, which has a housing 2 and a cover assembly device 14 connected thereto, consisting of a first cover assembly 5 and a second cover assembly 6.

[0056] The first cover assembly 5 is fixed to the first end of the housing 2 in a transverse direction R2. The second cover assembly 6 is fixed to the second end of the housing 2 in a transverse direction R2. The first cover assembly 5 and the second cover assembly 6 are arranged in a parallel manner to each other.

[0057] Both the first cover assembly 5 and the second cover assembly 6 have a stamped metal frame 11, which is connected to the housing 2 of the prismatic battery cell 3 by welding connection 27. The metal frame 11 is connected to the substrate 12 in a force-fit and form-fit manner in the longitudinal direction R1.

[0058] The first cover assembly 5 has an injection port 24 and a bursting region 22, which are directly integrated into the substrate 12 through molding. The bursting region 22 is as follows: Figure 1 The structure shown has a first blasting region 22a located within a second blasting region 22b. The first blasting region 22a has lower compressive strength and heat resistance than the second blasting region 22b.

[0059] The first cover assembly 5 also has an electrode feeder 21, which is connected to the negative electrode 7 in the inner cavity of the prismatic battery cell 3, such that the electrode feeder 21 of the first cover assembly 5 constitutes the anode 25. In the case of lithium-ion batteries, the anode 25 is preferably made of copper, and in the case of sodium-ion batteries, the anode 25 is preferably made of aluminum.

[0060] The second cover assembly 6 has an injection port 24 and an electrode feed passage 21. The injection port 24 is integrated into the substrate 12 by molding. The electrode feed passage 21 is implemented as a first insert 31 and is connected to the positive electrode 8 inside the prismatic battery cell 3. Thus, the electrode feed passage 21 of the second cover assembly 6 constitutes the cathode 26.

[0061] The electrode feeders 21 of the first and second cover assemblies 5 and 6 are connected to the substrate 12 in a form-fitting manner in the longitudinal direction R1 and the transverse direction R2 by means of a dovetail joint.

[0062] The injection port 24 of the first cover assembly 6 is located at the first end along the longitudinal direction R1. The injection port 24 of the second cover assembly 5 is located at the second end along the longitudinal direction R1. Thus, when the prismatic battery cell 3 is vertically oriented upward along the longitudinal direction R1, the electrolyte 9 can be fed into the inner cavity of the prismatic battery cell 3 from below through the injection port 24 in the first cover assembly 5, while the displaced gas escapes through the injection port 24 in the second cover assembly 6.

[0063] In addition to the foregoing written description of the invention, reference is made hereto to the accompanying drawings for further explanation of the disclosure.

Claims

1. A cover assembly for a prismatic battery cell (3), the cover assembly comprising • A metal frame (11), wherein the metal frame (11) is configured to be fixed to the housing (2) of the prismatic battery cell (3), • A substrate (12) made of electrically insulating plastic, said substrate (12) being disposed on the metal frame (11) and forming a form-fitting and / or material-fitting and / or force-fitting connection with the metal frame (11), and • At least one first insert (31), wherein, The first insert (31) is fixed to the substrate (12) in a form-fit manner. •The first insert (31) is an electrode feedthrough (21).

2. The cover assembly according to claim 1, wherein, The electrode feeder (21) is a plate component with a U-shaped cross-section, which is coplanar with the substrate (12).

3. The cover assembly according to claim 1, wherein, A tenon-and-groove joint, a dovetail joint, or a meshing tooth system is formed between the electrode feeder (21) and the substrate (12).

4. The cover assembly according to any one of the preceding claims, wherein, The plastic of the substrate (12) is a thermoplastic, an elastomer, a thermosetting plastic, or a thermoplastic elastomer.

5. The cover assembly according to any one of the preceding claims, wherein, The cover assembly (1) includes a bursting zone (22).

6. The cover assembly according to claim 5, wherein, The bursting region (22) is embedded in the substrate (12) as a second insert (32), or the bursting region (22) is integrated into the substrate (12) by reducing the wall thickness.

7. The cover assembly according to claim 5 or 6, wherein, The cover assembly (1) includes a first bursting region (22a) and a second bursting region (22b), wherein the compressive strength of the second bursting region (22b) is higher than that of the first bursting region (22a).

8. The cover assembly according to any one of claims 5 to 7, wherein, The substrate (12) includes a reinforcing structure, particularly a rib (13), which is arranged adjacent to the blasting region (22) to define the direction of outflow from the blasting region (22).

9. The cover assembly according to any one of the preceding claims, wherein, The metal frame (11) is constructed as a stamped part, a casting, or a formed profile.

10. The cover assembly according to any one of the preceding claims, wherein, The substrate (12) includes a coating (23) that reduces gas permeation.

11. The cover assembly according to any one of the preceding claims, wherein, The substrate (12) has at least one injection port (24).

12. The cover assembly according to claim 11, wherein, The injection port (24) is embedded in the substrate (12) as a third insert (33).

13. A cover assembly device (14) comprising a first cover assembly (5) as claimed in any of the preceding claims, wherein the electrode feed (21) of the first cover assembly (5) is an anode (25), and comprising a second cover assembly (6) as claimed in any of the preceding claims, wherein the electrode feed (21) of the second cover assembly (6) is a cathode (26), and wherein the first cover assembly (5) and the second cover assembly (6) are configured to be fixed at opposite ends of the prismatic battery cell (3).

14. A prismatic battery cell (3), the prismatic battery cell (3) comprising a housing (2), an energy storage device (4), and a cover assembly (1) as claimed in any one of claims 1 to 12 or a cover assembly device (14) as claimed in claim 13.

15. A method for manufacturing a cover assembly (1) for a prismatic battery cell (3), the method comprising the following steps: - The metal frame (11) and the first insert (31), which is an electrode feedthrough (21), are arranged opposite each other. - A substrate (12) is manufactured on the metal frame (11) and on the first insert (31) by means of an injection molding process, such that a form fit, material fit and / or force fit connection is formed between the substrate (12) and the metal frame (11), and a form fit connection is formed between the first insert (31) and the substrate (12).

16. The method of manufacturing the cover assembly (1) according to claim 15, wherein, In the injection molding process, a second insert (32) including a bursting region (22) and / or a third insert (33) including an injection port (24) are connected to the substrate (12).

17. The method of manufacturing the cover assembly (1) according to claim 15 or 16, wherein, The bursting region (22) is integrally placed into the substrate (12) through the injection molding process.

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