Top cover assembly, battery, battery pack and electric device

Abstract

This utility model provides a top cover assembly, a battery, a battery pack, and an electrical device. The top cover assembly includes a top cover with an inner surface and an outer surface arranged opposite to each other. The top cover also has a connection hole extending from the inner surface to the outer surface, allowing the electrode tabs of the battery cell to pass through the connection hole from one side of the inner surface of the top cover and connect to an external device. In an embodiment of this utility model, the top cover of the top cover assembly has a connection hole, allowing the electrode tabs to pass through the connection hole and connect to the external device themselves. This eliminates the need for connectors and terminals, reduces the welding process of connectors, electrode tabs, and terminals in the top cover assembly, thereby reducing resistance during current transmission and improving the battery's current output capability.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, specifically to a top cover 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 tabs of the battery cell are fixed to the terminals of the cover plate structure by welding with connectors. The welding process involves multiple welding steps, resulting in higher resistance. Utility Model Content

[0004] The present invention provides a battery that can improve the technical problem of high resistance between the top cover assembly and the battery cell in related technologies.

[0005] In a first aspect, embodiments of the present invention provide a top cover assembly, comprising:

[0006] The top cover includes an inner surface and an outer surface arranged opposite to each other. The top cover also has a connection hole that extends from the inner surface to the outer surface, so that the electrode of the power supply core passes through the connection hole from one side of the inner surface of the top cover and connects to an external device.

[0007] In one embodiment, the top cover assembly further includes a fixing block disposed on one side of the outer surface of the top cover, so that the electrode tab can be connected and fixed to the fixing block after passing through the connection hole.

[0008] In one embodiment, the fixing block is provided with fixing holes for accommodating at least a portion of the tabs.

[0009] In one embodiment, the top cover assembly further includes a sealing ring sandwiched between the tab and the wall of the connection hole to seal the connection hole.

[0010] In one embodiment, the top cover assembly further includes a first insulating member, the first insulating member comprising:

[0011] A first main body portion is disposed on one side of the inner surface of the top cover to insulate the top cover from the battery cell;

[0012] A first extension portion, one end of which is connected to the first main body portion, and the other end of which extends into the connecting hole and is connected to the sealing ring.

[0013] Secondly, embodiments of the present invention provide a battery, comprising:

[0014] A housing, the housing having a receiving cavity and an opening;

[0015] Top cover assembly, the top cover assembly being connected to the housing to close the opening; and,

[0016] The battery cell includes a cell body and tabs. The cell body is disposed within the receiving cavity, and the tabs pass through the top cover assembly for electrical connection with external devices.

[0017] In one embodiment, the battery cell is provided with a plurality of tabs, each tab including a first connection end and a second connection end disposed opposite to each other. The first connection end is connected to the battery cell body, and at least some of the second connection ends of the tabs pass through the top cover assembly for electrical connection with external devices.

[0018] In one embodiment, at least some of the tabs are stacked and welded together.

[0019] Thirdly, embodiments of the present invention provide a battery pack including the battery as described in the foregoing embodiments.

[0020] Fourthly, embodiments of the present invention provide an electrical device, including a battery as described in the foregoing embodiments or a battery pack as described in the foregoing embodiments.

[0021] The beneficial effects of the embodiments of this utility model are as follows:

[0022] In an embodiment of this utility model, the top cover of the top cover assembly is provided with a connection hole, so that the tabs themselves can pass through the connection hole to connect to external devices, eliminating the need for connectors and terminals, reducing the process of welding connectors, tabs and terminals in the top cover assembly, thereby reducing the resistance in the current transmission process and improving the current output capability of the battery. Attached Figure Description

[0023] 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.

[0024] Figure 1 This is a schematic diagram of the exploded structure of a battery provided in an embodiment of this utility model;

[0025] Figure 2 This is a top view of the battery provided in an embodiment of this utility model;

[0026] Figure 3 This is a cross-sectional view of the battery provided in an embodiment of this utility model;

[0027] Figure 4 yes Figure 3 Enlarged view of point B in the middle;

[0028] Figure 5 This is a schematic diagram of the structure of the first insulating member provided in an embodiment of this utility model;

[0029] Figure 6 This is a schematic diagram of the structure of the second insulating member provided in an embodiment of this utility model;

[0030] Figure 7 This is a schematic diagram of the exploded structure of another battery provided in an embodiment of this utility model;

[0031] Figure 8 yes Figure 7 A cross-sectional view of part of the battery structure.

[0032] The labels in the diagram are as follows:

[0033] 1. Top cover assembly;

[0034] 11. Top cover; 111. Inner surface; 112. Outer surface; 113. Connecting hole; 114. Recessed platform;

[0035] 12. Fixing block; 121. Fixing hole;

[0036] 13. Connectors;

[0037] 14. Sealing ring;

[0038] 15. First insulating component; 151. First main body portion; 152. First extension portion;

[0039] 16. Second insulating member; 161. Second main body; 162. Second extension; 163. Extension portion;

[0040] 2. Battery;

[0041] 21. Shell;

[0042] 22. Battery cell; 221. Electrode; 2211. First connection terminal; 2212. Second connection terminal. Detailed Implementation

[0043] 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.

[0044] 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.

[0045] 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 that element.

[0046] Reference Figures 1 to 3 The first aspect of this utility model provides a top cover assembly 1, including a top cover 11, a connector 13, and a sealing ring 14. The top cover 11 has a connection hole 113. The top cover 11 includes an inner surface 111 and an outer surface 112. The inner surface 111 faces the battery cell 22, and the outer surface 112 is disposed opposite to the inner surface 111. The connector 13 passes through the top cover 11. A portion of the connector 13 is located on the side of the inner surface 111 of the top cover 11 for electrical connection with the battery cell 22. A portion of the connector 13 is located on the side of the outer surface 112 of the top cover 11. The sealing ring 14 is accommodated in the connection hole 113 and is sandwiched between the connector assembly and the hole wall of the connection hole 113. The diameter of the sealing ring 14 is less than or equal to 10 mm.

[0047] The top cover 11 serves as the main body of the sealing structure in the battery 2, with its inner surface 111 facing the cell 22 to protect and seal the cell 22. The size and shape of the top cover 11 are usually determined according to the model of the battery 2, and this utility model does not impose any limitations on them.

[0048] The connector 13 is used to connect the battery cell 22 to an external device, which can be a relay device such as a busbar or an electrical device; this invention does not limit this. Since one end of the connector 13 is connected to the tab 221 of the battery cell 22, and the other end passes through the cover plate to connect to the external device, the connector 13 typically has a certain bending structure. Specifically, the thickness of the connector 13 can be controlled to be small, for example, less than 5mm, giving the connector 13 good flexibility. It can be bent according to actual needs, increasing the applicability of the connector 13 and making installation more flexible. Alternatively, the connector 13 can be manufactured with a bending structure so that bending is not required during installation, reducing the probability of damage to the connector 13. In this case, the flexibility requirement for the connector 13 is lower, allowing the use of a connector 13 with higher mechanical strength and extending its service life.

[0049] The sealing ring 14 is housed within the connecting hole 113, meaning it is completely located within the top cover 11 and does not encroach on space outside the top cover 11. This increases the installation space for the battery cell 22 and improves the energy density of the battery 2 made from the top cover assembly 1 in this invention. The sealing ring 14 is sandwiched between the connecting assembly and the wall of the connecting hole 113. Through an interference fit, the sealing ring 14's own elasticity achieves a seal on the connecting hole 113, significantly improving the sealing performance of the top cover assembly 1. This effectively prevents electrolyte leakage or the intrusion of external contaminants, while also buffering mechanical stress caused by temperature changes or vibration, reducing the probability of metal fatigue and fretting wear. Furthermore, the sealing ring 14 also provides a certain degree of insulation, preventing direct connection between the connecting piece and the top cover 11, ensuring the safety of the battery 2 in use.

[0050] If the diameter of the sealing ring 14 is greater than 10mm, the sealing ring 14 will be too large, occupying too much installation space, thus compressing the installation space of the connector 13 and resulting in lower structural strength of the connector 13. Therefore, in this embodiment of the invention, the diameter of the sealing ring 14 is set to be less than or equal to 10mm. For example, it can be 10mm, 9mm, 8mm, 7mm, 6mm, 5mm, 4mm, 3mm, 2mm, 1mm, etc., so that the volume of the sealing ring 14 is smaller, reducing the impact of the sealing ring 14 on the connector and ensuring the flow capacity of the connector.

[0051] In this embodiment of the present invention, the top cover assembly 1 is provided with a sealing ring 14 which is accommodated in the connection hole 113 of the top cover 11, and the size of the sealing ring 14 is controlled to be less than 10mm. By means of the mutual compression of the connector 13, the sealing ring 14 and the hole wall of the connection hole 113 to form a seal, the space occupied by the sealing ring 14 is small, thereby providing more space for the battery cell 22 and the connector 13, thereby improving the energy density and current transmission capability of the battery 2 made by the top cover assembly 1.

[0052] In one embodiment, reference is made to Figure 3 and Figure 4 The sealing ring 14 has a circular cross-section; and / or the diameter of the sealing ring 14 is greater than or equal to 0.1 mm.

[0053] By setting the cross-section of the sealing ring 14 to be circular, the sealing ring 14 can produce uniform deformation under pressure, avoiding local stress concentration and reducing the probability of the sealing ring 14 tearing or permanent deformation. Furthermore, the circular cross-section sealing ring 14 is easy to standardize and produce, with low cost and high yield, making it suitable for large-scale battery manufacturing.

[0054] If the diameter of the sealing ring 14 is less than 0.1 mm, the structural strength of the sealing ring 14 is low, and it is prone to breakage due to processing errors or assembly stress. Furthermore, an excessively small diameter may result in insufficient elasticity of the sealing ring 14, making it unable to form the necessary interference fit pressure. Therefore, in this embodiment of the invention, the diameter of the sealing ring 14 is set to be greater than or equal to 0.1 mm. For example, it can be 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, etc., so that the sealing ring 14 has sufficient strength and sealing performance, reducing the probability of seal failure.

[0055] 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.

[0056] In one embodiment, reference is made to Figure 4 and Figure 5 The top cover assembly 1 also includes a first insulating member 15, which includes a first main body portion 151 and a first extension portion 152. The first main body portion 151 is disposed on the side of the inner surface 111 of the top cover 11 to insulate the top cover 11 from the battery cell 22. One end of the first extension portion 152 is connected to the first main body portion 151, and the other end of the first extension portion 152 extends into the connection hole 113 and abuts against the sealing ring 14.

[0057] Accordingly, the first insulating member 15 can reduce the possibility of short circuits between the portion of the connector 13 located inside the top cover 11 and the top cover 11, ensuring the safety of the battery 2. Furthermore, by extending the first extension portion 152 from the first main body portion 151 into the connection hole 113 and abutting against the sealing ring 14, complete insulation is achieved from the inner surface 111 of the top cover 11 to the interior of the connection hole 113, further reducing the probability of short circuits between the tab 221 or the connector 13 and the top cover 11. Simultaneously, it fills the assembly gap within the connection hole 113, inhibiting leakage of contaminants or electrolyte along the hole wall. Understandably, the first extension portion 152 also supports the sealing ring 14, preventing displacement of the sealing ring 14 during installation or impact, simplifying the assembly of the sealing ring 14, improving the stability of the sealing ring 14 installation, and thus enhancing the safety and reliability of the battery 2.

[0058] In one embodiment, the first extension 152 is arranged in a ring shape to abut against various parts of the sealing ring 14 in the circumferential direction. By making the first extension 152 ring-shaped, it can abut against the sealing ring 14 uniformly throughout the entire circumferential range, thereby uniformly applying pressure and enhancing the consistency of the radial deformation of the sealing ring 14, avoiding sealing failure caused by local stress concentration, and improving the stability of the battery 2.

[0059] In one embodiment, reference is made to Figure 4 and Figure 5 The top cover assembly 1 also includes a second insulating member 16, which includes a second main body portion 161 and a second extension portion 162. The second main body portion 161 is disposed on the side of the outer surface 112 of the top cover 11 to insulate the top cover 11 from the battery cell 22. The second extension portion 162 has one end connected to the second main body portion 161 and the other end extending into the connection hole 113 so that the sealing ring 14 is sandwiched between the second extension portion 162 and the first extension portion 152.

[0060] Accordingly, the second insulating member 16 can reduce the possibility of short circuits between the portion of the connector 13 located on the outside of the top cover 11 and the top cover 11, ensuring the safety of the battery 2. Furthermore, by extending the second extension portion 162 from the second main body portion 161 into the connection hole 113 and abutting against the sealing ring 14, complete insulation is achieved from the outer surface 112 of the top cover 11 to the interior of the connection hole 113, reducing the probability of short circuits between the connector 13 and the top cover 11. Simultaneously, it fills the assembly gap within the connection hole 113, inhibiting leakage of contaminants or electrolyte along the hole wall. Understandably, the second extension portion 162 can also cooperate with the first extension portion 152 to clamp the sealing ring 14, preventing displacement of the sealing ring 14 during installation or impact, improving the stability of the sealing ring 14 installation, and thus enhancing the safety and reliability of the battery 2.

[0061] In one embodiment, the second extension 162 is arranged in a ring shape to abut against various points around the sealing ring 14. By making the second extension 162 ring-shaped, it can abut against the sealing ring 14 uniformly throughout its circumference, thereby uniformly applying pressure and enhancing the consistency of radial deformation of the sealing ring 14, avoiding seal failure caused by local stress concentration, and improving the stability of the battery 2.

[0062] In one embodiment, reference is made to Figure 6 The second insulating member 16 also includes an extension 163, which protrudes from the outer surface 112 of the second main body 161 to increase the creepage distance between the connector 13 and the top cover 11. By extending the creepage distance between the connector 13 and the top cover 11, the extension 163 significantly improves the electrical insulation performance of the top cover assembly 1 and effectively reduces the risk of high voltage breakdown.

[0063] In one embodiment, the second main body 161 includes a top surface facing away from the top cover 11 and a side surface connected to the top surface near the top cover 11. An extension 163 is disposed on at least one of the top surface and the side surface. By providing extensions 163 on the top surface and the side surface, the creepage distance between the connector 13 and the top cover 11 can be extended. Multiple extensions 163 may be provided, with each extension 163 respectively disposed on the top surface and the side surface of the first main body 151, thereby improving the insulation effect of the extensions 163.

[0064] In one embodiment, reference is made to Figure 1 The top cover 11 also includes a recessed platform 114, which is disposed on the outer surface 112 of the top cover 11 and communicates with the connecting hole 113. At least a portion of the second main body 161 is accommodated in the recessed platform 114.

[0065] The three-dimensional structure of the recessed platform 114 can limit the circumferential position of the second main body 161, which can not only achieve precise assembly of the second insulating component 16, but also effectively prevent the radial displacement of the second insulating component 16 by the side wall of the recessed platform 114, and the bottom wall of the recessed platform 114 can provide a stable axial support surface, reducing the probability of the second insulating component 16 becoming loose or shifting.

[0066] In some alternative embodiments, the cross-sectional area of ​​the recessed platform 114 decreases continuously along the direction from the outer surface 112 of the top cover 11 toward the inner surface 111 of the top cover 11. That is, the peripheral side surface of the recessed platform 114 is an inclined curved surface, thereby playing a guiding role and making the installation of the second insulating member 16 easier.

[0067] In one embodiment, reference is made to Figure 1The top cover assembly 1 also includes a fixing block 12, which is disposed on the outer surface 112, and the connector 13 is riveted or welded to the fixing block 12. The fixing block 12 is disposed on the outer surface 112 of the top cover 11 and is used to fix the portion of the connector 13 exposed on the outer surface 112 of the top cover 11. The fixing block 12 can be connected to the connector 13 by riveting or welding. Riveting generates less heat, which can reduce the impact on other structures in the battery 2; welding can improve the connection strength and sealing of the connection between the fixing block 12 and the connector 13.

[0068] Understandably, the fixing block 12 can be made of metal. In this case, there is a passage between the fixing block 12 and the connector 13, which means that the fixing block 12 can also serve to connect external devices, thereby improving the current flow capacity of the top cover assembly 1.

[0069] In an optional embodiment, at least a portion of the fixing block 12 is disposed around the connector 13. Accordingly, the surrounding fixing block 12 ensures that the welding or riveting force is evenly distributed along the circumference of the connector 13, reducing the probability of displacement or loosening of the connector 13 when subjected to vibration or impact; at the same time, it increases the contact area between the fixing block 12 and the top cover 11, reducing the probability of excessive pressure between the fixing block 12 and the top cover 11, which could lead to damage.

[0070] In one embodiment, on the plane where the outer surface 112 is located, the distance between the outer peripheral edge of the orthographic projection of the extension 163 and the outer peripheral edge of the orthographic projection of the fixing block 12 is greater than or equal to 1.5 mm and less than or equal to 3 mm.

[0071] While ensuring that the extension 163 has good insulation performance, it is also necessary to prevent the extension 163 from being too long and occupying too much installation space, thereby interfering with other components. For example, the distance between the outer peripheral edge of the orthographic projection of the extension 163 and the outer peripheral edge of the orthographic projection of the fixing block 12 can be 1.5mm, 2mm, 2.5mm, 3mm, etc., and this embodiment of the utility model does not limit this.

[0072] In some implementations, refer to Figure 7 and Figure 8 This utility model embodiment also provides a top cover assembly 1, including a top cover 11. The top cover 11 includes an inner surface 111 and an outer surface 112 disposed opposite to each other. The top cover 11 is also provided with a connection hole 113, which extends from the inner surface 111 to the outer surface 112, so that the electrode 221 of the power supply core 22 passes through the connection hole 113 from one side of the inner surface 111 of the top cover 11 and connects to an external device.

[0073] In an embodiment of this utility model, the top cover 11 of the top cover assembly 1 is provided with a connection hole 113, so that the tab 221 can pass through the connection hole 113 to connect to an external device. This eliminates the need for the connector 13 and the pole, reduces the process of welding the connector 13, the tab 221 and the pole in the top cover assembly 1, thereby reducing the resistance in the current transmission process and improving the current output capability of the battery 2.

[0074] In one embodiment, the top cover assembly 1 further includes a fixing block 12, which is disposed on the side of the outer surface 112 of the top cover 11, so that the tab 221 can be connected and fixed to the fixing block 12 after passing through the connection hole 113.

[0075] In one embodiment, the fixing block 12 is provided with a fixing hole 121 to accommodate at least a portion of the tab 221. By providing the fixing hole 121 within the fixing block 12, the contact area between the tab 221 and the fixing block 12 is increased, improving the stability of the connection between the tab 221 and the fixing block 12. It is understood that the end of the tab 221 can be accommodated within the fixing hole 121, thereby allowing the tab 221 to connect to an external device via the fixing block 12; alternatively, the tab 221 can pass through the fixing hole 121 to protrude outside the fixing block 12, thereby allowing the tab 221 to connect directly to an external device.

[0076] According to a second aspect of the present invention, a battery 2 is provided, with reference to... Figure 1 The battery 2 includes a housing 21, a battery cell 22, and a top cover assembly 1 as described in the previous embodiment. The housing 21 has a receiving cavity and an opening; the battery cell 22 is disposed within the receiving cavity; the top cover assembly 1 and the housing 21 are connected to close the opening, and the connector 13 is electrically connected to the tab 221 of the battery cell 22. Since the battery 2 includes the aforementioned top cover assembly 1, it possesses all the beneficial effects of the aforementioned top cover assembly 1, which will not be elaborated further in this embodiment.

[0077] The housing 21 can be a rigid housing, such as a rigid plastic housing, an aluminum housing, or a steel housing; the housing 21 can also be a flexible housing, such as a pouch-type flexible housing. The material of the flexible housing can be plastic, such as at least one of polypropylene (PP), polybutylene terephthalate (PBT), and polybutylene succinate (PBS).

[0078] The battery 2 of this application may be in the form of a battery cell, a battery module, or a battery pack. In some embodiments, battery cells may be assembled into a battery module, and the number of battery cells contained in a battery module may be one or more, the specific number of which can be selected by those skilled in the art based on the application and capacity of the battery module. In some embodiments, battery modules may also be assembled into a battery pack, and the number of battery modules contained in a battery pack may be one or more, the specific number of which can be selected by those skilled in the art based on the application and capacity of the battery pack.

[0079] In some implementations, refer to Figure 7 and Figure 8 This utility model embodiment also provides a battery 2, including a housing 21, a top cover assembly 1 and a battery cell 22. The housing 21 has a receiving cavity and an opening; the top cover assembly 1 is connected to the housing 21 to close the opening; the battery cell 22 includes a battery cell body and a tab 221. The battery cell body is disposed in the receiving cavity, and the tab 221 passes through the connection hole 113 of the top cover assembly 1 for electrical connection with an external device.

[0080] In other words, in this embodiment, the connector 13 and the terminal post are eliminated. The tab 221 can pass through the top cover assembly 1 and serve to connect to external devices. This reduces the process of welding the connector 13, the tab 221 and the terminal post in the top cover assembly 1, reduces the resistance in the current transmission process, and improves the current output capability of the battery 2.

[0081] In one embodiment, the battery cell 22 is provided with a plurality of tabs 221, each tab 221 including a first connection end 2211 and a second connection end 2212 disposed opposite to each other. The first connection end 2211 is connected to the battery cell body, and at least some of the second connection ends 2212 of the tabs 221 pass through the top cover assembly 1 for electrical connection with external devices.

[0082] Multiple tabs 221 can be provided inside the battery cell 22 to improve the current output capability of the battery cell 22. The second connection ends 2212 of the multiple tabs 221 can all pass through the top cover assembly 1, thereby ensuring that each tab 221 can play the role of connecting to external devices and improving the current output capability of the battery 2; alternatively, only some tabs 221 can be controlled to pass through the top cover assembly 1, thereby reducing the requirements for the opening size of the top cover assembly 1 and improving the sealing performance of the top cover assembly 1.

[0083] In one embodiment, at least some of the tabs 221 are stacked and welded together. This makes the stacked tabs 221 more regular, reducing the space occupied by the tabs 221 and thus increasing the volume of the battery cell 22 within the battery 2, thereby increasing the energy density of the battery 2. Simultaneously, welding multiple tabs 221 together improves the tightness of the connection between the tabs 221, ensuring stability when the tabs 221 are connected to external devices.

[0084] According to a third aspect of the present invention, a battery pack is provided, which includes the battery 2 in the foregoing embodiments. Therefore, the battery pack has all the beneficial effects of the battery 2 described above. The embodiments of the present invention will not be repeated here.

[0085] According to a fourth aspect of this utility model, an electrical device is provided, which includes the battery 2 or battery pack as described in the foregoing embodiments. Therefore, this electrical device possesses all the beneficial effects of the aforementioned battery 2 or battery pack, and the embodiments of this utility model will not be repeated here. As one embodiment, the electrical device can be a pure electric vehicle, a hybrid electric vehicle, a plug-in hybrid electric vehicle, etc. To meet the high power and high energy density requirements of the battery 2, a battery pack or battery module can be used. As another embodiment, the device can be a mobile phone, tablet computer, laptop computer, etc. This device typically requires a thin and light design, and can use a single battery cell as the power source.

[0086] 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.

[0087] 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.

[0088] The embodiments, implementation methods, and related technical features of this application can be combined and substituted for each other without conflict.

[0089] 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, characterized in that, include: The top cover includes an inner surface and an outer surface arranged opposite to each other. The top cover also has a connection hole that extends from the inner surface to the outer surface, so that the electrode of the power supply core passes through the connection hole from one side of the inner surface of the top cover and connects to an external device.

2. The top cover assembly according to claim 1, characterized in that, The top cover assembly also includes a fixing block, which is disposed on one side of the outer surface of the top cover so that the electrode tab can be connected and fixed to the fixing block after passing through the connection hole.

3. The top cover assembly according to claim 2, characterized in that, The fixing block is provided with fixing holes for accommodating at least a portion of the tabs.

4. The top cover assembly according to claim 1, characterized in that, The top cover assembly also includes a sealing ring, which is sandwiched between the tab and the wall of the connection hole to seal the connection hole.

5. The top cover assembly according to claim 4, characterized in that, The top cover assembly further includes a first insulating element, the first insulating element comprising: A first main body portion is disposed on one side of the inner surface of the top cover to insulate the top cover from the battery cell; A first extension portion, one end of which is connected to the first main body portion, and the other end of which extends into the connecting hole and is connected to the sealing ring.

6. A battery, characterized in that, include: A housing, the housing having a receiving cavity and an opening; The top cover assembly as claimed in any one of claims 1 to 5, wherein the top cover assembly is connected to the housing to close the opening; and, The battery cell includes a cell body and tabs. The cell body is disposed within the receiving cavity, and the tabs pass through the connection holes of the top cover assembly for electrical connection with external devices.

7. The battery according to claim 6, characterized in that, The battery cell is provided with multiple tabs, each tab including a first connection end and a second connection end arranged opposite to each other. The first connection end is connected to the battery cell body, and at least some of the second connection ends of the tabs pass through the top cover assembly for electrical connection with external devices.

8. The battery according to claim 7, characterized in that, At least some of the tabs are stacked and welded together.

9. A battery pack, characterized in that, Includes the battery as described in any one of claims 6 to 8.

10. An electrical appliance, characterized in that, Includes the battery as described in any one of claims 6 to 8 or the battery pack as described in claim 9.

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