Battery top cover assembly, cover plate assembly, battery, battery pack and electric device

Abstract

The utility model provides a kind of top cover assembly of battery, cover plate assembly, battery, battery pack and electrical equipment.The battery includes electric core, electric core includes electric core body and tab, tab is equipped with butt joint, top cover assembly includes top cover and sealing ring, top cover includes inner surface and outer surface, inner surface is used to towards electric core body, outer surface and inner surface are oppositely arranged, top cover is equipped with connecting hole, connecting hole is penetrated by inner surface to outer surface, to be used for tab to connect external device by connecting hole;Sealing ring includes the first sealing portion and the second sealing portion that are connected, the first sealing portion is arranged in connecting hole, the second sealing portion is arranged in the inner surface side of top cover, so that the second sealing portion can be clamped between butt joint and inner surface.The second sealing portion of the sealing ring is clamped between butt joint and top cover inner surface in the application, so that the second sealing portion can be attached to top cover under mechanical pressure, form stable sealing interface, effectively prevent electrolyte leakage and external pollutant intrusion.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, specifically to a top cover assembly, a cover plate assembly, a battery, a battery pack, and an electrical device. Background Technology

[0002] A battery typically consists of a casing, battery cells, and a top cover assembly. The battery cells are housed within the casing, and the top cover assembly is connected to the casing to seal it. The top cover assembly is also electrically connected to the battery cells to output electrical energy.

[0003] In related technologies, the sealing ring in the top cover assembly is not installed stably and is prone to falling off, resulting in poor sealing performance. Utility Model Content

[0004] The present invention provides a top cover assembly for a battery, which can improve the technical problem of poor sealing effect of top cover assemblies in related technologies.

[0005] In a first aspect, embodiments of the present invention provide a top cover assembly for a battery, the battery including a cell, the cell including a cell body and tabs, the tabs having abutment portions, and the top cover assembly including:

[0006] A top cover, comprising an inner surface and an outer surface, the inner surface facing the battery cell body, and the outer surface facing away from the inner surface, the top cover having a connection hole extending from the inner surface to the outer surface for connecting the electrode tab to an external device via the connection hole; and,

[0007] A sealing ring, comprising a first sealing portion and a second sealing portion connected together, wherein the first sealing portion is disposed within the connecting hole and the second sealing portion is disposed on one side of the inner surface of the top cover, such that the second sealing portion can be sandwiched between the abutting portion and the inner surface.

[0008] In one embodiment, the first sealing portion is annular;

[0009] And / or, the second seal is annular.

[0010] Secondly, embodiments of the present invention provide a cover plate assembly, comprising:

[0011] The top cover assembly described in the foregoing embodiments;

[0012] The electrode has an abutment portion, and the second sealing portion of the sealing ring is sandwiched between the abutment portion and the inner surface.

[0013] In one embodiment, the electrode tab further includes an electrode tab body, and the abutting portion protrudes from the outer periphery of the electrode tab body along the radial direction of the connecting hole;

[0014] The electrode body passes through the connection hole, and one end of the electrode body away from the battery cell body is located on the outer surface of the top cover for connecting to an external device; or, the top cover assembly further includes a connecting piece, which passes through the connection hole, one end of the connecting piece is fixedly electrically connected to the electrode body, and the other end of the connecting piece is used to connect to an external device.

[0015] In one embodiment, the abutment portion is annular and surrounds the outer periphery of the tab body;

[0016] The electrode body is also inserted through the sealing ring.

[0017] In one embodiment, the abutting portion is integrally formed with the tab body; and / or, the abutting portion is fixedly electrically connected to the tab body.

[0018] In one embodiment, along the thickness direction of the top cover, the thickness of the abutment portion is greater than or equal to 0.5 mm and less than or equal to 10 mm.

[0019] In one embodiment, the length of the abutment portion is greater than or equal to 0.1 mm and less than or equal to 10 mm along the direction away from the tab body.

[0020] In one embodiment, the thickness of the abutment portion gradually decreases along the direction away from the tab body.

[0021] In one embodiment, the abutting portion includes a first surface and a second surface, the first surface being oriented toward the battery cell, the second surface being disposed opposite to the first surface, and the sealing ring being sandwiched between the second surface and the inner surface; the first surface is inclined to the plane of the top cover, and the second surface is parallel to the plane of the top cover.

[0022] In one embodiment, the cover plate assembly further includes a fixing block disposed on the outer surface;

[0023] When the tab body is inserted through the connection hole, and one end of the tab body away from the battery cell body is located on the outer surface of the top cover for connecting external devices, the fixing block is integrally formed with the tab body and / or the fixing block is fixedly electrically connected to the tab body.

[0024] When the top cover assembly further includes a connecting piece, the connecting piece passing through the connecting hole, one end of the connecting piece being fixedly electrically connected to the tab body, and the other end of the connecting piece being used to connect to an external device, the fixing block is integrally formed with the connecting piece and / or the fixing block is fixedly electrically connected with the connecting piece.

[0025] Thirdly, embodiments of the present invention provide a battery including the cover assembly described in the foregoing embodiments.

[0026] Fourthly, embodiments of the present invention provide a battery pack, including the battery described in the foregoing embodiments.

[0027] Fifthly, embodiments of the present invention provide an electrical device, including the battery or battery pack described in the foregoing embodiments.

[0028] The beneficial effects of the embodiments of this utility model are as follows:

[0029] In embodiments of this invention, by sandwiching the second sealing portion of the sealing ring between the abutment portion and the inner surface of the top cover, the second sealing portion can tightly adhere to the top cover under mechanical pressure, reducing the probability of the sealing ring falling off and forming a stable sealing interface. This effectively prevents electrolyte leakage and the intrusion of external contaminants, thereby improving the safety and lifespan of the battery assembled using the top cover assembly of this application. Furthermore, no additional parts are required on the top cover assembly to abut the sealing ring, reducing the number of components in the top cover assembly, thus simplifying the assembly operation and improving the production efficiency of the top cover assembly. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1 This is a schematic diagram of the battery structure provided in an embodiment of the present invention;

[0032] Figure 2 This is a schematic diagram of the sealing ring provided in an embodiment of the present invention;

[0033] Figure 3 This is a cross-sectional view of a portion of the structure of the top cover assembly provided in an embodiment of this utility model;

[0034] Figure 4 yes Figure 1 A cross-sectional view of part of the battery structure;

[0035] Figure 5 This is a schematic diagram of the first structure of the electrode provided in an embodiment of this utility model;

[0036] Figure 6This is a schematic diagram of the second structure of the electrode provided in an embodiment of this utility model;

[0037] Figure 7 This is a schematic diagram of the third structure of the electrode provided in an embodiment of this utility model.

[0038] The labels in the diagram are as follows:

[0039] 1. Battery;

[0040] 11. Top cover assembly;

[0041] 111. Top cover; 1111. Inner surface; 1112. Outer surface; 1113. Connecting hole;

[0042] 112. Sealing ring; 1121. First sealing part; 1122. Second sealing part;

[0043] 12. Battery cells;

[0044] 121. Battery cell body;

[0045] 122, tab; 1221, contact portion; 1221a, first surface; 1221b, second surface;

[0046] 1222. Electrode body; 1223. Fixing block;

[0047] 123. Connecting piece;

[0048] H1, the thickness direction of the top cover;

[0049] H2, the direction of the contact part away from the electrode body. Detailed Implementation

[0050] The embodiments of this application are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0051] To enable those skilled in the art to better understand the solutions of this application, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0052] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0053] Reference Figures 1 to 4 The first aspect of this utility model provides a top cover assembly 11 for a battery 1. The battery 1 includes a cell 12, which includes a cell body 121 and a tab 122. The tab 122 has an abutment portion 1221. The top cover assembly 11 includes a top cover 111 and a sealing ring 112. The top cover 111 includes an inner surface 1111 and an outer surface 1112. The inner surface 1111 faces the cell body 121, and the outer surface 1112 is disposed opposite to the inner surface 1111. A connection hole 1113 is provided, extending from the inner surface 1111 to the outer surface 1112, for the tab 122 to connect to an external device through the connection hole 1113. The sealing ring 112 includes a first sealing part 1121 and a second sealing part 1122 connected together. The first sealing part 1121 is disposed in the connection hole 1113, which can both seal the connection hole 1113 and prevent the tab 122 or other connecting structures from communicating with the top cover, thus preventing a short circuit inside the battery. The second sealing part 1122 is disposed on one side of the inner surface 1111 of the top cover 111, so that the second sealing part 1122 can be sandwiched between the abutment part 1221 and the inner surface 1111.

[0054] The top cover 111 serves as the main body of the sealing structure in the battery 1, with its inner surface 1111 facing the cell body 121 to protect and seal the cell body 121. The size and shape of the top cover 111 are usually determined according to the model of the battery 1, and this utility model does not impose any limitations on them. The tabs 122 can be connected to external devices through the connection holes 1113 on the top cover 111. The external devices can be connection devices such as busbars, or electrical devices, and this utility model does not impose any limitations on them.

[0055] The first sealing part 1121 of the sealing ring 112 is disposed inside the connecting hole 1113, and the second sealing part 1122 is disposed on one side of the inner surface 1111 of the top cover 111. This allows the second sealing part 1122 to be pressed against the inner surface 1111 of the top cover 111 by the abutment part 1221 of the tab 122, forming a stable sealing interface. This effectively prevents electrolyte leakage or external contaminants (such as moisture and oxygen) from entering the battery 1, thereby improving the safety and lifespan of the battery 1. The second sealing part 1122 can be a protrusion disposed on the peripheral side of the first sealing part 1121. After the battery 1 is assembled, the abutment part 1221 presses the protrusion against the inner surface 1111 of the top cover 111. There can also be multiple protrusions, which are spaced apart on the peripheral side of the first sealing part 1121 to increase the contact area between the second sealing part 1122 and the abutment part 1221, reduce the pressure between them, reduce the probability of damage, and improve the sealing performance of the sealing ring 112. Understandably, other structures, such as plastic parts, may be provided between the inner surface of the top cover 111 and the second sealing part 1122, so that the abutting part 1221 abuts the second sealing part 1122 against the plastic part.

[0056] This embodiment of the invention places the second sealing portion 1122 of the sealing ring 112 between the abutment portion 1221 and the inner surface 1111 of the top cover 111. This allows the second sealing portion 1122 to tightly adhere to the top cover 111 under mechanical pressure, reducing the probability of the sealing ring 112 falling off and forming a stable sealing interface. This effectively prevents electrolyte leakage and the intrusion of external contaminants, thereby improving the safety and lifespan of the battery 1 assembled with the top cover assembly 11 of this application. Furthermore, no additional parts are required on the top cover assembly 11 to abut the sealing ring 112, reducing the number of parts constituting the top cover assembly 11, thus simplifying the assembly operation and improving the production efficiency of the top cover assembly 11.

[0057] In one embodiment, reference is made to Figure 2 The first sealing part 1121 is annular; and / or the second sealing part 1122 is annular.

[0058] When the first sealing part 1121 adopts an annular structure, it can form a uniform and continuous sealing interface around the inner wall of the connection hole 1113 between the electrode tab 122 and the top cover 111, effectively sealing the gap between the electrode tab 122 and the connection hole 1113 on the top cover, preventing electrolyte from seeping out along the hole wall or external contaminants from seeping in. When under pressure (such as when the electrode tab 122 is inserted or the abutment part 1221 is pressed), the annular first sealing part 1121 can expand uniformly in all directions, ensuring a 360° seal without dead angles, while also accommodating any slight misalignment or dimensional tolerances that may exist in the electrode tab 122, thus improving sealing reliability. Furthermore, the annular structure facilitates standardized production and reduces manufacturing costs.

[0059] When the second sealing part 1122 adopts an annular structure, it can provide uniform support force between the inner surface 1111 and the abutment part 1221, avoiding local stress concentration that could cause deformation or damage to the sealing ring 112. Furthermore, the annular second sealing part 1122 can cover a larger contact area, dispersing the clamping force of the abutment part 1221 and reducing wear on the inner surface 1111 of the top cover 111.

[0060] It should be noted that in this application, "and / or" describes the relationship between related objects, indicating that there can be three relationships. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / ", unless otherwise specified, generally indicates that the related objects before and after it are in an "or" relationship.

[0061] Secondly, referring to Figures 3 to 5 The present invention also provides a cover plate assembly including the top cover assembly 11 and the electrode tab 122 in the aforementioned embodiments; the electrode tab 122 is provided with an abutment portion 1221, and at least a portion of the sealing ring 112 is sandwiched between the abutment portion 1221 and the inner surface 1111 to meet the sealing requirements.

[0062] By providing an abutment portion 1221 on the tab 122 and sandwiching the second sealing portion 1122 of the sealing ring 112 between the abutment portion 1221 and the inner surface 1111 of the top cover 111, the second sealing portion 1122 is tightly fitted to the top cover 111 under mechanical pressure, forming a stable sealing interface. This effectively prevents electrolyte leakage and the intrusion of external contaminants, thereby improving the safety and service life of the battery 1. Secondly, the pressing action of the abutment portion 1221 ensures a stable connection between the tab 122 and the top cover 111, reducing loosening caused by vibration or thermal cycling, lowering contact resistance, and optimizing conductivity reliability. At the same time, this embodiment of the invention reduces welding or gluing operations, simplifies the assembly process, and reduces production costs.

[0063] In one embodiment, reference is made to Figure 5 The tab 122 also includes a tab body 1222, with an abutment portion 1221 protruding from the outer periphery of the tab body 1222 along the radial direction of the connection hole 1113. The tab body 1222 passes through the connection hole 1113, and one end of the tab body 1222 away from the battery cell body 121 is located on the outer surface 1112 of the top cover 111 for connecting to external devices. Alternatively, the top cover assembly 11 may also include a connecting piece 123, which passes through the connection hole 1113. One end of the connecting piece 123 is electrically and fixedly connected to the tab body 1222 by welding, such as friction welding or brazing, and the other end of the connecting piece 123 is used to connect to external devices.

[0064] The connecting piece 123 passes through the connecting hole 1113 and is electrically connected to the tab body 1222. There is no need to set up a pole structure. The connector directly passes through the connecting hole 1113 and connects to the tab 122, eliminating the traditional welding step between the pole and the connecting piece 123. This avoids increased resistance at the welding point between the pole and the connecting piece 123 and reduces the risk of pole loosening, greatly improving the reliability of the current transmission path. It is especially suitable for battery 1 applications that need to be in complex environments such as long-term vibration.

[0065] The tab body 1222 is directly inserted through the connection hole 1113 and extends to one side of the outer surface 1112 of the top cover 111 to connect to external equipment. This makes the cover plate assembly in this embodiment of the utility model simple and compact in structure, eliminates other connecting parts, reduces assembly steps and contact resistance, improves conductivity, and reduces the risk of failure due to welding or loose connection.

[0066] In one embodiment, reference is made to Figure 4 and Figure 5 The abutment portion 1221 is annular and surrounds the outer periphery of the tab body 1222 along the radial direction of the connecting hole 11131113; the tab body 1222 is also inserted through the sealing ring 112.

[0067] By setting the abutment portion 1221 in an annular shape and surrounding the radial outer periphery of the tab body 1222, the annular abutment portion 1221 can apply pressure evenly, so that the second sealing portion 1122 of the sealing ring 112 forms a stable and balanced compression seal on the inner surface 1111 of the top cover 111, avoiding seal failure caused by local stress concentration. At the same time, the tab body 1222 passes through the sealing ring 112, and the tight fit between the tab body 1222 and the sealing ring 112 can effectively seal the gap between the tab 122 and the connection hole 1113, improve the sealing performance, and prevent electrolyte leakage / or intrusion of external contaminants.

[0068] In one embodiment, reference is made to Figure 6 The contact portion 1221 and the tab body 1222 are integrally formed. Through an integral forming process (such as stamping, casting, or extrusion), the contact portion 1221 and the tab body 1222 are seamlessly connected, significantly improving mechanical strength and conductive continuity. Furthermore, the integral structure results in a more uniform stress distribution under pressure, better stabilizing the sealing ring and better resisting fatigue fracture caused by vibration or cell expansion, while reducing contact resistance and improving current transmission efficiency. The integrally formed tab 122 also simplifies the assembly process of the cover plate assembly of this application and reduces manufacturing costs.

[0069] In another embodiment, reference is made to Figure 7The abutment part 1221 is fixedly electrically connected to the tab body 1222 by welding (such as laser welding or ultrasonic welding). The abutment part 1221 and the tab body 1222 can be processed separately and then combined. Different materials or the same materials are allowed for both. For example, the tab body 1222 can be made of high-conductivity copper and the abutment part 1221 can be made of high-strength steel, so that the tab 122 has good conductivity and structural strength. Furthermore, the separate design of the abutment part 1221 and the tab body 1222 can reduce the processing difficulty of the tab 122.

[0070] In one embodiment, along the thickness direction H1 of the top cover, the thickness of the abutment portion 1221 is greater than or equal to 0.5 mm and less than or equal to 10 mm.

[0071] Along the thickness direction H1 of the top cover, if the thickness of the abutment portion 1221 is less than 0.5mm, the strength of the abutment portion 1221 is low, resulting in poor support for the compression seal of the sealing ring 112, making it prone to deformation and leading to a decrease in sealing performance. If the thickness of the abutment portion 1221 is greater than 10mm, the volume of the abutment portion 1221 is too large, which may easily interfere with other structures. Therefore, in this embodiment of the utility model, the thickness of the abutment portion 1221 is set to be greater than or equal to 0.5mm and less than or equal to 10mm. For example, it can be 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1.0mm, 2.0mm, 3.0mm, 4.0mm, 5.0mm, 6.0mm, 7.0mm, 8.0mm, 9.0mm, 10.0mm, etc., so that the abutment portion 1221 has sufficient structural strength to support the sealing ring 112 while maintaining a moderate volume, thereby reducing the probability of seal failure.

[0072] In one embodiment, along the direction H2 away from the tab body, the length of the abutment portion 1221 is greater than or equal to 0.1 mm and less than or equal to 10 mm.

[0073] Along the direction H2 away from the tab body, if the length of the abutment portion 1221 is less than 0.1mm, the abutment portion 1221 is too small, and the support effect for the sealing ring 112 is poor. The sealing ring 112 is prone to deformation, thereby reducing the sealing performance. If the length of the abutment portion 1221 is greater than 10mm, the volume of the abutment portion 1221 is too large, and it is easy to interfere with other structures. Therefore, in this embodiment of the utility model, the length of the abutment portion 1221 is set to be greater than or equal to 0.1 mm and less than or equal to 10 mm. For example, it can be 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.6 mm, 0.8 mm, 1.0 mm, 2.0 mm, 3.0 mm, 4.0 mm, 5.0 mm, 6.0 mm, 7.0 mm, 8.0 mm, 9.0 mm, 10.0 mm, etc., so that the contact area between the abutment portion 1221 and the sealing ring 112 is large when the volume of the abutment portion 1221 is moderate, reducing the probability of the sealing ring 112 undergoing severe deformation, thereby reducing the probability of sealing failure.

[0074] In one embodiment, reference is made to Figure 5 Along the direction away from the tab 122, the thickness of the abutment portion 1221 gradually decreases. With the gradually decreasing thickness, the center of gravity of the abutment portion 1221 is more biased towards the tab body 1222, thereby reducing the torque at the connection between the abutment portion 1221 and the tab body 1222, lowering the probability of the abutment portion 1221 being deformed by the sealing ring 112, ensuring the sealing performance of the sealing ring 112, and improving the stability of the cover plate assembly in this application.

[0075] In one embodiment, reference is made to Figure 5 The contact portion 1221 includes a first surface 1221a and a second surface 1221b. The first surface 1221a faces the battery cell 12, and the second surface 1221b is disposed opposite to the first surface 1221a. The sealing ring 112 is sandwiched between the second surface 1221b and the inner surface 1111. The first surface 1221a is inclined to the plane of the top cover 111, and the second surface 1221b is parallel to the plane of the top cover 111.

[0076] The second surface 1221b is parallel to the plane of the top cover 111, allowing the sealing ring 112 to be sandwiched relatively evenly between the second surface 1221b and the inner surface 1111 of the top cover 111. This results in more uniform pressure on the sealing ring 112 and reduces the probability of damage. The first surface 1221a is inclined, which shifts the center of gravity of the abutment portion 1221 more towards the tab body 1222, thereby reducing the torque at the connection between the abutment portion 1221 and the tab body 1222 and lowering the probability of deformation of the abutment portion 1221.

[0077] In one embodiment, reference is made to Figure 6and Figure 7 The cover assembly also includes a fixing block 1223, which is disposed on the outer surface 1112 of the top cover;

[0078] When the tab body 1222 passes through the connection hole 1113, and the end of the tab body 1222 away from the battery cell body 121 is located on the outer surface 1112 side of the top cover 111 for connecting external devices, the fixing block 1223 is integrally formed with the tab body 1222 and / or the fixing block 1223 is fixedly electrically connected with the tab body 1222.

[0079] When the top cover assembly 11 also includes a connecting piece 123, the connecting piece 123 passes through the connecting hole 1113, one end of the connecting piece 123 is fixedly electrically connected to the tab body 1222, and the connection method is welding, such as friction welding or brazing. When the other end of the connecting piece 123 is used to connect to external equipment, the fixing block 1223 is integrally formed with the connecting piece 123 and / or the fixing block 1223 is fixedly electrically connected with the connecting piece 123.

[0080] The fixing block 1223 is disposed on the outer surface 1112 of the top cover 111 and is used to fix the part of the electrode tab 122 or the connector exposed on the outer surface 1112 of the top cover 111. The fixing block 1223 is fixedly electrically connected to the electrode tab 122 or the connector by welding or integral molding, thereby improving the connection strength and sealing of the connection between the fixing block 1223 and the electrode tab 122 or the connector.

[0081] According to a third aspect of the present invention, a battery 1 is provided, which includes the cover assembly in the foregoing embodiments. Therefore, the battery 1 has all the beneficial effects of the cover assembly described above. The embodiments of the present invention will not be described again here.

[0082] According to a fourth aspect of the present invention, a battery pack is provided, which includes the battery 1 in the foregoing embodiments. Therefore, the battery pack has all the beneficial effects of the battery 1 described above. The embodiments of the present invention will not be repeated here.

[0083] According to a third aspect of the present invention, an electrical device is provided, which includes the battery 1 or battery pack in the foregoing embodiments. Therefore, the electrical device has all the beneficial effects of the battery 1 or battery pack. The embodiments of the present invention will not be described again here.

[0084] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0085] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0086] The embodiments, implementation methods, and related technical features of this application can be combined and substituted for each other without conflict.

[0087] The above are merely preferred embodiments of this application and are not intended to limit this application in any way. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of this application without departing from the scope of the technical solution of this application shall still fall within the scope of the technical solution of this application.

Claims

1. A top cover assembly of a battery, characterized by comprising: The battery includes a cell, the cell includes a cell body and tabs, the tabs are provided with abutment portions, and the top cover assembly includes: A top cover, comprising an inner surface and an outer surface, the inner surface facing the battery cell body, and the outer surface facing away from the inner surface, the top cover having a connection hole extending from the inner surface to the outer surface for connecting the electrode tab to an external device via the connection hole; and, A sealing ring, comprising a first sealing portion and a second sealing portion connected together, wherein the first sealing portion is disposed within the connecting hole and the second sealing portion is disposed on one side of the inner surface of the top cover, such that the second sealing portion can be sandwiched between the abutting portion and the inner surface.

2. The roof assembly of claim 1, wherein, The first sealing part is annular; and / or, the second sealing part is annular.

3. A cover plate assembly characterized by, include: The top cover assembly as described in claim 1 or 2; The electrode has an abutment portion, and the first sealing portion of the sealing ring is sandwiched between the abutment portion and the inner surface.

4. The cover plate assembly of claim 3, wherein, The electrode lug also includes an electrode lug body, and along the radial direction of the connecting hole, the abutting portion protrudes from the outer periphery of the electrode lug body; The electrode body passes through the connection hole, and one end of the electrode body away from the battery cell body is located on the outer surface of the top cover for connecting to an external device; or, the top cover assembly further includes a connecting piece, which passes through the connection hole, one end of the connecting piece is fixedly electrically connected to the electrode body, and the other end of the connecting piece is used to connect to an external device.

5. The cover plate assembly of claim 4, wherein, The abutting part is annular and surrounds the outer periphery of the tab body along the radial direction of the connecting hole. The electrode body is also inserted through the sealing ring.

6. The cover plate assembly of claim 4, wherein, The abutting part is integrally formed with the electrode body; and / or, the abutting part is fixedly electrically connected to the electrode body.

7. The cover plate assembly of claim 4, wherein, Along the thickness direction of the top cover, the thickness of the abutment portion is greater than or equal to 0.5 mm and less than or equal to 10 mm.

8. The cover plate assembly of claim 4, wherein, Along the direction of the abutment portion away from the tab body, the length of the abutment portion is greater than or equal to 0.1 mm and less than or equal to 10 mm.

9. The cover plate assembly of claim 4, wherein, Along the direction away from the tab body, the thickness of the abutment gradually decreases.

10. The cover plate assembly of claim 9, wherein, The abutting portion includes a first surface and a second surface. The first surface faces the battery cell, and the second surface is disposed opposite to the first surface. The sealing ring is sandwiched between the second surface and the inner surface. The first surface is inclined to the plane of the top cover, and the second surface is parallel to the plane of the top cover.

11. The cover plate assembly of claim 4, wherein, The cover plate assembly further includes a fixing block disposed on the outer surface; When the tab body is inserted through the connection hole, and one end of the tab body away from the battery cell body is located on the outer surface of the top cover for connecting external devices, the fixing block is integrally formed with the tab body and / or the fixing block is fixedly electrically connected to the tab body. When the top cover assembly further includes a connecting piece, the connecting piece passing through the connecting hole, one end of the connecting piece being fixedly electrically connected to the tab body, and the other end of the connecting piece being used to connect to an external device, the fixing block is integrally formed with the connecting piece and / or the fixing block is fixedly electrically connected with the connecting piece.

12. A battery, characterized by Includes the cover plate assembly as described in any one of claims 4 to 11.

13. A battery pack, characterized by, Includes the battery as described in claim 12.

14. An electrical device, characterized by Includes the battery as described in claim 12 or the battery pack as described in claim 13.

Images