Top cover assembly and battery

Abstract

The utility model discloses a top cover assembly and a battery. The top cover assembly comprises: a pole comprising a first metal layer and a second metal layer arranged along a first direction; the sealing ring is arranged outside the second metal layer in a sleeving manner; the metal sleeve is sleeved outside the sealing ring; the upper plastic is clamped between the second metal layer and the metal sleeve; the cover plate is arranged on the periphery of the metal sleeve and is connected with the metal sleeve; wherein the first metal layer, the second metal layer, the sealing ring, the metal sleeve and the upper plastic are embedded in an extrusion mode. The top cover assembly, the first metal layer, the second metal layer, the sealing ring, the metal sleeve and the upper plastic are installed in an extrusion mode, the installation mode is simpler, the assembly cost is reduced, and the connection internal resistance is reduced.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a top cover assembly and a battery. Background Technology

[0002] The top cover assembly is a structure installed at the end of a square housing to seal the housing. In existing battery top covers, the assembly of the entire top cover assembly is performed as follows: Figure 1 As shown, it includes a cover plate 1', an electrode post 5', a pressure plate 6', a base plate 4' disposed at the bottom of the electrode post 5', an upper plastic 2' disposed between the pressure plate 6' and the cover plate 1', and a lower plastic 3' disposed between the base plate 4' and the cover plate 1'; when the electrode post 5' is used as the negative electrode, the base plate 4' is a copper base plate 4', the electrode post 5' is an aluminum electrode post 5', and the pressure plate 6' is also an aluminum pressure plate 6'.

[0003] During assembly, the copper base plate 4' and aluminum pole 5' are mostly joined using copper-aluminum friction welding to form a friction weld seam B', thus bonding the copper base plate 4' and aluminum pole 5' together. Then, the aluminum pole 5' and aluminum pressure plate 6' are connected by riveting, and finally, a weld seam A' is formed at the riveting joint using laser technology, fusing the aluminum pole 5' and aluminum pressure plate 6' together. This process requires multiple welding operations for the entire top cover assembly, resulting in a complex assembly method and high production costs. Utility Model Content

[0004] To address at least one problem existing in the prior art, according to one aspect of the present invention, a top cover assembly is provided, comprising:

[0005] The pole includes a first metal layer and a second metal layer sequentially disposed along a first direction;

[0006] A sealing ring is fitted over the second metal layer;

[0007] A metal sleeve is fitted over the sealing ring;

[0008] Plastic is applied and sandwiched between the second metal layer and the metal sleeve;

[0009] A cover plate is disposed on the outer periphery of the metal sleeve and connected to the metal sleeve;

[0010] The first metal layer, the second metal layer, the sealing ring, the metal sleeve, and the upper plastic are joined together by extrusion.

[0011] In some embodiments, the thickness H1 of the first metal layer along the first direction ranges from 2.0 to 2.5 mm.

[0012] In some embodiments, the second metal layer includes a first embedded segment and a connecting segment arranged at an angle, the first embedded segment fitting into the first metal layer, and the connecting segment being used to connect to an adapter piece.

[0013] In some embodiments, along the first direction, the thickness of the first embedded segment is less than the thickness of the connecting segment.

[0014] In some embodiments, the thickness H2 of the first embedded segment ranges from 0.5 to 1.0 mm, and the thickness H3 of the connecting segment ranges from 2.0 to 5.0 mm.

[0015] In some embodiments, the first metal layer has a first slot on the side facing the second metal layer, and the second metal layer has a first protrusion on the side facing the first metal layer, with the first protrusion embedded in the first slot.

[0016] In some embodiments, the width of the first slot in the direction perpendicular to the first direction is 1 / 10 to 1 / 6 of the width of the first metal layer.

[0017] In some embodiments, the first protrusion is located at the junction of the first embedded segment and the connecting segment.

[0018] In some embodiments, the connecting segment has a first groove on the side opposite to the first metal layer, and the top wall of the first groove is used to connect with the adapter piece.

[0019] In some embodiments, the second metal layer has a third groove on the side facing the sealing ring, the third groove being used to engage with the sealing ring, and the depth H4 of the third groove along the first direction is in the range of 0.2-0.8 mm.

[0020] In some embodiments, the compression of the sealing ring is 15%-45%.

[0021] In some embodiments, the thickness H5 of the metal sleeve along the first direction ranges from 0.5 to 1.0 mm.

[0022] In some embodiments, the metal sleeve includes a first segment and a second segment arranged at an angle, the first segment being sandwiched between the cover plate and the upper plastic, the second segment being positioned between the cover plate and the sealing ring, the connection area of ​​the first segment and the second segment fitting into the sealing ring, and the first segment protruding radially from the upper plastic along the first metal layer.

[0023] In another aspect, the present invention provides a battery comprising the aforementioned top cover assembly.

[0024] In summary, the top cover assembly and battery provided by this utility model have the following technical effects:

[0025] The first metal layer, the second metal layer, the sealing ring, the metal sleeve, and the upper plastic are joined together by extrusion. The upper plastic can also be sandwiched between the second metal layer and the metal sleeve. Multiple components can be directly formed into a whole by external force. Finally, the cover plate and the metal sleeve are connected, for example by welding. Thus, the forming method of the entire top cover assembly is simple and the process is simple, which can reduce production costs. Compared with the prior art, which requires welding between the first and second metal layers and welding the second metal layer to the terminal of the battery cell through an adapter piece, this application only requires welding the second metal layer and the adapter piece, reducing the number of welding positions, reducing the internal resistance of the connection between the terminal and the battery cell, and improving the performance of the battery. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of a top cover assembly in the prior art;

[0027] Figure 2 This is a schematic diagram of the structure of the first metal layer, the second metal layer, the sealing ring, the metal sleeve, and the upper plastic before pressing in an embodiment of the present invention.

[0028] Figure 3 for Figure 2 Enlarged view of point I in the middle;

[0029] Figure 4 This is a schematic diagram of the structure of the first metal layer, the second metal layer, the sealing ring, the metal sleeve, and the upper plastic after pressing according to an embodiment of the present utility model.

[0030] Figure 5 This is a schematic diagram of the top cover assembly according to an embodiment of the present invention.

[0031] Attached Figure: 100-Top cover assembly, 10-Pole post, 11-First metal layer, 111-First slot, 112-Second protrusion, 12-Second metal layer, 121-First protrusion, 122-Second slot, 123-First groove, 124-First embedding section, 125-Connecting section, 126-Third slot, 20-Sealing ring, 21-Second embedding section, 22-Barrier section, 30-Metal sleeve, 31-First section, 32-Second section, 40-Upper plastic, 50-Cover plate, 51-Second groove, 60-Lower plastic. Detailed Implementation

[0032] To better understand and implement this invention, the technical solutions in the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings.

[0033] In the description of this utility model, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0034] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0035] The present invention will now be described in further detail with reference to the accompanying drawings.

[0036] Please see Figures 2 to 5 The top cover assembly 100 provided in this embodiment of the utility model includes a pole post 10, a sealing ring 20, a metal sleeve 30, an upper plastic 40, and a cover plate 50.

[0037] The pole post 10 includes a first metal layer 11 and a second metal layer 12 stacked along a first direction a. A sealing ring 20 is sleeved on the second metal layer 12. A metal sleeve 30 is sleeved on the sealing ring 20. An upper plastic 40 is sandwiched between the second metal layer 12 and the metal sleeve 30. A cover plate 50 is disposed on the outside of the metal sleeve 30 and connected to the metal sleeve 30. The first metal layer 11, the second metal layer 12, the sealing ring 20, the metal sleeve 30, and the upper plastic 40 are fitted together by extrusion.

[0038] The aforementioned top cover assembly 100, comprising the first metal layer 11, the second metal layer 12, the sealing ring 20, the metal sleeve 30, and the upper plastic 40, is assembled by extrusion. The upper plastic 40 can also be sandwiched between the second metal layer 12 and the metal sleeve 30. The five components can be directly molded into a whole by external force. Finally, the cover plate 50 and the metal sleeve 30 are connected, for example by welding. Thus, the molding method of the entire top cover assembly 100 is simple and the process is straightforward, which can reduce production costs. Compared with the prior art, where the first metal layer 11 and the second metal layer 12 need to be welded together, and the second metal layer 12 is then welded to the terminal post 10 of the battery cell via an adapter piece, in this embodiment, only the second metal layer 12 and the adapter piece need to be welded together. This reduces the number of welding positions, lowers the connection internal resistance between the terminal post 10 and the battery cell, and improves the battery's performance.

[0039] In this embodiment, the electrode post 10 includes two metal layers. When the electrode post 10 is the negative electrode post 10, the first metal layer 11 is an aluminum layer and the second metal layer 12 is a copper layer. In the prior art, the aluminum layer and the copper layer are usually connected by welding, which leads to a complex process and a high resistance after welding.

[0040] Understandably, in the above structure, the upper plastic 40 serves as insulation and protection between the terminal post 10 and the cover plate 50, separating the cover plate 50 and the terminal post 10 to prevent short circuits and ensure stable electrical performance and safe use of the battery. The sealing ring 20 ensures the sealing of the battery after the top cover assembly 100 is applied to the prismatic battery, preventing electrolyte leakage and preventing external air, moisture, and other impurities from entering the battery, ensuring battery performance and safety, and extending battery life. By setting the metal sleeve 30, since the upper plastic 40 and the sealing ring 20 are made of plastic, when they are pressed and fitted with the first metal layer 11 and the second metal layer 12 respectively, the plastic material has a certain degree of deformability, resulting in loose pressing. By setting the metal sleeve 30, a compressive force can be applied to the sealing ring 20 and the upper plastic 40, so that the five components can be pressed and fixed.

[0041] The structure of the first metal layer 11, the second metal layer 12, the sealing ring 20, the metal sleeve 30, and the upper plastic 40 before extrusion molding in this embodiment is as follows: Figure 2 and Figure 3 As shown, the structure after extrusion molding is as follows Figure 3 As shown, the structure after welding with cover plate 50 is as follows: Figure 5 As shown.

[0042] Since the cover plate 50 is made of aluminum, the metal sleeve 30 in this embodiment is preferably made of aluminum. Both have the same melting temperature, which makes it easy to weld them into a whole.

[0043] The first metal layer 11 needs to be welded to the aluminum bar. During the welding process, melting will occur, and the welding strength needs to be guaranteed. Therefore, the thickness H1 of the first metal layer 11 along the first direction a is in the range of 2.0-2.5mm. This ensures that the thickness of the first metal layer 11 is not too thick, which would result in a high overall height of the top cover assembly 100. It also avoids the first metal layer 11 being too thin, which would make it difficult to weld to the aluminum bar.

[0044] In some embodiments, the thickness H1 of the first metal layer 11 along the first direction a can be 2.0 mm, 2.1 mm, 2.2 mm, 2.3 mm, 2.4 mm or 2.5 mm, etc., and is not limited here.

[0045] Please see Figures 2 to 5In one embodiment of this utility model, the second metal layer 12 includes a first embedded section 124 and a connecting section 125 arranged at an angle. Specifically, the two are arranged perpendicularly. The first embedded section 124 is fitted into the first metal layer 11, and the connecting section 125 is used to connect with the adapter piece. The outer diameter of the first embedded section 124 is larger than the outer diameter of the connecting section 125. Thus, by providing a first embedded section 124 with a larger coverage area, it can connect with the first metal layer 11, increase the connection area between the first metal layer 11 and the second metal layer 12, increase the support strength of the first metal layer 11, ensure the connection area between the two, and avoid the situation of breakage at the connection between the first embedded section 124 and the connecting section 125.

[0046] Furthermore, along the radial direction of the first metal layer 11, the outer edge of the first embedded segment 124 coincides with the outer edge of the first metal layer 11. This ensures that the first embedded segment 124 and the first metal layer 11 have sufficient connection area. At the same time, when the upper plastic 40 is connected, the upper plastic 40 can contact the outer edges of the first metal layer 11 and the first embedded segment 124 respectively, ensuring the sealing of the upper plastic 40 with the first metal layer 11 and the first embedded segment 124 respectively.

[0047] In this configuration, the first embedded section 124 and the connecting section 125 are arranged along the first direction a. The thickness of the first embedded section 124 is less than the thickness of the connecting section 125. Since the first embedded section 124 is used to fit with the first metal layer 11, and the first metal layer 11, the upper plastic 40, the metal sleeve 30, and the cover plate 50 need to be arranged sequentially along the first direction a, by setting the thinner first embedded section 124, the thickness of the entire top cover assembly 100 can be set within a predetermined range, avoiding an excessively thick overall top cover assembly 100. By setting the thicker connecting section 125, since the connecting section 125 needs to be welded with an adapter piece, melting will occur during welding. Therefore, setting the thicker connecting section 125 facilitates welding with the adapter piece, ensures the connection strength with the adapter piece, and avoids the risk of breakage during welding.

[0048] Specifically, the thickness H2 of the first embedded section 124 ranges from 0.5 to 1.0 mm, and the thickness H3 of the connecting section 125 ranges from 2.0 to 5.0 mm. This ensures that the first embedded section 124 has sufficient supporting strength to prevent breakage, while also preventing the overall thickness of the top cover assembly 100 from being too large. The connecting section 125 has sufficient supporting thickness to facilitate welding with the adapter piece, while also ensuring the supporting strength of the entire pole post 10. The thickness H2 of the first embedded section 124 can be set to values ​​such as 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, or 1.0 mm, which is not limited here. The thickness H3 of the connecting section 125 can be set to values ​​such as 2.0 mm, 2.1 mm, 2.2 mm, 2.3 mm, 2.4 mm, or 2.5 mm, which is not limited here.

[0049] Specifically, please refer to Figure 3 When the first embedded segment 124 and the first metal layer 11 are fitted together, the first metal layer 11 is provided with a first slot 111 on the side facing the second metal layer 12, and the second metal layer 12 is provided with a first protrusion 121 on the side facing the first metal layer 11. The first protrusion 121 is embedded in the first slot 111. The stability of the fitting is ensured by the fitting of the slot and the protrusion, and relative separation is avoided. The cross-section of the first slot 111 is a right trapezoid with an inclined surface, which has a guiding function during compression. In other embodiments, it can also be provided in the shape of a square, triangle or other shapes.

[0050] The width of the first slot 111 along the direction perpendicular to the first direction a can be 1 / 10 to 1 / 6 of the width of the first metal layer 11. This allows the first metal layer 11 and the second metal layer 12 to have a certain fitting area, which is not too large to avoid affecting the compression between the first metal layer 11 and the second metal layer 12, while also avoiding the fitting area being too small to affect the connection strength. For example, the width of the first slot 111 along the radial direction of the first metal layer 11 can be 1 / 10, 1 / 8, or 1 / 6 of the radius of the first metal layer 11, etc., and is not limited here.

[0051] Furthermore, to ensure the strength of the fit, the first protrusion 121 is located at the junction of the first insert segment 124 and the connecting segment 125. For example, when the first protrusion 121 is located at the junction of the first insert segment 124 and the connecting segment 125... Figures 2 to 5 As shown, the second metal layer 12 is provided with a second slot 122 facing the center area of ​​the first metal layer 11, and the first metal layer 11 is provided with a second protrusion 112 on the side facing the second metal layer 12. The second protrusion 112 is engaged in the second slot 122. The connection between the first metal layer 11 and the second metal layer 12 is made by connecting the middle area to ensure the connection strength between the two.

[0052] In addition, a plurality of first slots 111 can be provided radially on the first metal layer 11, and a plurality of first protrusions 121 can be provided on the second metal layer 12. Each first protrusion 121 is fitted into a first slot 111. The connection area is ensured by the connection between the plurality of first slots 111 and the plurality of first protrusions 121, thereby ensuring the connection strength.

[0053] Please see Figures 2 to 5 In one embodiment of this utility model, since the second metal layer 12 is typically made of copper, which is relatively expensive, a first groove 123 is provided on the side of the connecting section 125 away from the first metal layer 11 to save costs. The top wall of the first groove 123 is used to connect with the adapter piece, that is, the second metal layer 12 is set in a hollow manner, and the hollow part does not contain copper material, which can achieve the effect of reducing costs. In another embodiment, the second metal layer 12 can also be set as a solid structure, which facilitates stamping with the first metal layer 11 during forming, and has a planar lower surface, which has a larger contact area with the stamping mechanism during stamping.

[0054] Further, please refer to Figure 1 Corresponding to the connecting segment 125 of the second metal layer 12, which is a hollow structure, the thickness H3' of the area where the connecting segment 125 connects to the adapter piece ranges from 1.0 to 1.3 mm. Since this area needs to be welded to the adapter piece, the value of the thickness H3' of the area where the connecting segment 125 connects to the adapter piece is set to ensure the support strength and connection strength, and to avoid the risk of breakage due to high temperature during welding.

[0055] Please see Figure 3 In one embodiment of this utility model, in order to ensure the fitting strength between the second metal layer 12 and the sealing ring 20, a third groove 126 is provided on the side of the second metal layer 12 facing the sealing ring 20. The third groove 126 is used to fit with the sealing ring 20. Along the first direction a, the depth H4 of the third groove 126 ranges from 0.2 to 0.8 mm. Thus, by providing the third groove 126, the sealing ring 20 is embedded in the second metal layer 12, ensuring the tightness of the connection between the second metal layer 12 and the sealing ring 20, while simultaneously providing the third groove The depth H4 of the third groove 126 is set in the range of 0.2-0.8mm, which allows for a certain connection area with the sealing ring 20, so that the sealing ring 20 can be tightly clamped in the second metal layer 12. This value setting ensures that the depth of the third groove 126 is not too shallow, which would result in a low connection strength between the second metal layer 12 and the sealing ring 20. It also avoids the situation where the sealing ring 20 cannot fill the third groove 126 when the depth is set too deep, resulting in air in the third groove 126 and causing poor sealing during later use.

[0056] The depth H4 of the third card slot 126 can be set to values ​​such as 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm or 0.8mm, and is not limited here.

[0057] Understandably, please refer to Figure 4 and Figure 5 In this embodiment, the sealing ring 20 includes a second embedding section 21 and a blocking section 22. The second embedding section 21 is embedded in the third groove 126 of the second metal layer 12, and the blocking section 22 blocks the space between the second metal layer 12 and the metal sleeve 30, thereby providing electrical insulation between the metal sleeve 30 and the second metal layer 12. The thickness of the second embedding section 21 is the same as the thickness of the upper plastic 40. (See also...) Figure 4 The thickness L of the barrier section 22 along the radial direction of the first metal layer 11 ranges from 1.0 to 1.6 mm, so that the barrier section 22 has a certain barrier thickness and a certain structural strength, thereby achieving electrical insulation between the second metal layer 12 and the metal sleeve 30 and the cover plate 50 respectively.

[0058] The thickness L of the barrier segment 22 along the radial direction of the first metal layer 11 can be 1.0mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm or 1.6mm, etc., and is not limited here.

[0059] In addition, after the extrusion assembly of the first metal layer 11, the second metal layer 12, the sealing ring 20, the metal sleeve 30 and the upper plastic 40 are completed, the compression of the sealing ring 20 is 15%-45%. By setting this compression, the sealing effect is achieved, but the compression is too small and it is easy to fall off. It also avoids the situation where the sealing ring 20 is prone to aging due to excessive compression.

[0060] In some embodiments, the compression of the sealing ring 20 can be set to values ​​such as 15%, 20%, 25%, 30%, 35%, 40%, or 45%, and is not limited thereto.

[0061] Please see Figure 1 In this embodiment, the thickness H5 of the metal sleeve 30 is in the range of 0.5-1.0 mm to ensure the pressing strength between the first metal layer 11, the second metal layer 12, the sealing ring 20 and the upper plastic 40. This setting enables the metal sleeve 30 to have a certain structural strength, and during pressing, it can provide a pre-tightening force to the pressing between the first metal layer 11, the second metal layer 12, the sealing ring 20 and the upper plastic 40. At the same time, it has a certain thickness, which also facilitates the subsequent welding connection with the cover plate 50.

[0062] The thickness H5 of the metal sleeve 30 can be set to values ​​such as 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm or 1.0mm, and is not limited here.

[0063] Specifically, in this embodiment, the metal sleeve 30 includes a first segment 31 and a second segment 32 arranged at an angle. Specifically, the two segments are arranged perpendicularly. The first segment 31 is sandwiched between the cover plate 50 and the upper plastic 40, and the second segment 32 is positioned between the cover plate 50 and the sealing ring 20. The connection area of ​​the first segment 31 and the second segment 32 is fitted with the sealing ring 20. Along the radial direction of the first metal layer 11, the first segment 31 protrudes from the upper plastic 40. Thus, the metal sleeve 30 and the sealing ring 20 are also fitted together, thereby ensuring a tight connection. By making the first segment 31 protrude from the upper plastic 40, that is, the edge of the first segment 31 is exposed relative to the upper plastic 40, it is convenient to weld the first segment 31 and the cover plate 50 into a whole.

[0064] Further, please refer to Figure 5 In order to ensure the connection strength between the cover plate 50 and the entire metal sleeve 30, the cover plate 50 is provided with a second groove 51 in the direction of the first segment 31, and the first segment 31 is located in the second groove 51. Thus, the second groove 51 on the cover plate 50 can be used to position the metal sleeve 30 and facilitate the welding connection between the cover plate 50 and the metal sleeve 30.

[0065] Understandably, the first metal layer 11, the second metal layer 12, the sealing ring 20, the metal sleeve 30, and the upper plastic 40 are assembled into a whole by extrusion. The metal sleeve 30 and the sealing ring 20 fit tightly together. The assembly of the entire top cover assembly 100 can be completed by welding the edge of the first section 31 to the cover plate 50.

[0066] Furthermore, the top cover assembly 100 may also include a lower plastic 60, which is disposed on the lower surface of the cover plate 50 along the first direction a and abuts against the ends of the second section 32 and the barrier section 22 along the first direction a. This serves to electrically insulate the cover plate 50 and the terminal post 10, preventing the terminal post 10 from directly contacting the battery casing and causing a short circuit. At the same time, by providing the lower plastic 60, the lower plastic 60 forms multiple sealing interfaces with the cover plate 50 and the terminal post 10, respectively, preventing electrolyte from seeping out from the gap between the terminal post 10 and the cover plate 50. During battery use, it can also absorb the mechanical vibration and impact that the battery experiences in the vehicle or equipment, reducing damage to the internal cell structure.

[0067] The aforementioned top cover assembly 100 simplifies the installation steps and reduces production costs by pressing the first metal layer 11, the second metal layer 12, the sealing ring 20, the metal sleeve 30, and the upper plastic 40 together. At the same time, it only requires subsequent welding of the second metal layer 12 and the adapter piece, which reduces the internal resistance during battery conduction.

[0068] In another embodiment of the present invention, a battery is also provided, including a square casing, a battery cell, and the aforementioned top cover assembly 100. The battery cell is disposed inside the square casing, and the top cover assembly 100 covers the opening of the square casing. The cover plate 50 is welded to the square casing to achieve a seal on the square casing.

[0069] The technical means disclosed in this utility model are not limited to those disclosed in the above embodiments, but also include technical solutions composed of any combination of the above technical features. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of this utility model, and these improvements and modifications are also considered within the scope of protection of this utility model.

Claims

1. A top cover assembly (100), characterized in that, include: The pole post (10) includes a first metal layer (11) and a second metal layer (12) disposed sequentially along a first direction; A sealing ring (20) is fitted over the second metal layer (12); A metal sleeve (30) is fitted over the sealing ring (20); Plastic (40) is sandwiched between the second metal layer (12) and the metal sleeve (30); A cover plate (50) is disposed on the outer periphery of the metal sleeve (30) and connected to the metal sleeve (30); The first metal layer (11), the second metal layer (12), the sealing ring (20), the metal sleeve (30), and the upper plastic (40) are fitted together by extrusion.

2. The top cover assembly (100) according to claim 1, characterized in that, The thickness H1 of the first metal layer (11) along the first direction ranges from 2.0 to 2.5 mm.

3. The top cover assembly (100) according to claim 1 or 2, characterized in that, The second metal layer (12) includes a first embedded section (124) and a connecting section (125) arranged at an angle. The first embedded section (124) is fitted into the first metal layer (11), and the connecting section (125) is used to connect with the adapter piece.

4. The top cover assembly (100) according to claim 3, characterized in that, Along the first direction, the thickness of the first embedded segment (124) is less than the thickness of the connecting segment (125).

5. The top cover assembly (100) according to claim 4, characterized in that, The thickness H2 of the first embedded segment (124) ranges from 0.5 to 1.0 mm, and the thickness H3 of the connecting segment (125) ranges from 2.0 to 5.0 mm.

6. The top cover assembly (100) according to claim 3, characterized in that, The first metal layer (11) has a first slot (111) on the side facing the second metal layer (12), and the second metal layer (12) has a first protrusion (121) on the side facing the first metal layer (11). The first protrusion (121) is embedded in the first slot (111).

7. The top cover assembly (100) according to claim 6, characterized in that, The width of the first slot (111) in the direction perpendicular to the first direction is 1 / 10 to 1 / 6 of the width of the first metal layer (11).

8. The top cover assembly (100) according to claim 6, characterized in that, The first protrusion (121) is located at the junction of the first embedded section (124) and the connecting section (125).

9. The top cover assembly (100) according to any one of claims 4-8, characterized in that, The connecting segment (125) has a first groove (123) on the side opposite to the first metal layer (11), and the top wall of the first groove (123) is used to connect with the adapter piece.

10. The top cover assembly (100) according to claim 1 or 2, characterized in that, The second metal layer (12) has a third groove (126) on the side facing the sealing ring (20). The third groove (126) is used to fit with the sealing ring (20). Along the first direction, the depth H4 of the third groove (126) is in the range of 0.2-0.8mm.

11. The top cover assembly (100) according to claim 1 or 2, characterized in that, The compression of the sealing ring (20) is 15%-45%.

12. The top cover assembly (100) according to claim 1 or 2, characterized in that, Along the first direction, the thickness H5 of the metal sleeve (30) ranges from 0.5 to 1.0 mm.

13. The top cover assembly (100) according to claim 1 or 2, characterized in that, The metal sleeve (30) includes a first segment (31) and a second segment (32) arranged at an angle. The first segment (31) is sandwiched between the cover plate (50) and the upper plastic (40), and the second segment (32) is positioned between the cover plate (50) and the sealing ring (20). The connection area of ​​the first segment (31) and the second segment (32) is fitted with the sealing ring (20). The edge of the first segment (31) protrudes from the upper plastic (40) along a direction perpendicular to the first direction.

14. A battery, characterized in that, Includes the top cover assembly (100) as described in any one of claims 1-13.

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