Top cover assembly, battery and electric device

Abstract

The application relates to a battery top cover, a battery and an electric device. The battery top cover comprises a top cover sheet provided with a first through hole and a second through hole; a first pole and a second pole with opposite polarities, the first pole is installed on the top cover sheet through the first through hole, and the second pole is installed on the top cover sheet through the second through hole; the first pole comprises a first pole body provided with a plug-in groove, a groove bottom of the plug-in groove is provided with a third through hole for the pole lug of a battery cell to pass through; and the first pole body is provided with a plug-in part configured to be inserted into the plug-in groove to realize electrical connection between the first pole and the pole lug of the battery cell. The technical scheme of the application is beneficial to fast charging and reduces the production cost.

Description

Technical Field

[0001] This application relates to the field of storage batteries, and in particular to a top cover assembly, a battery, and an electrical device. Background Technology

[0002] With the widespread use of portable devices such as mobile phones, laptops, electric toys, and even electric vehicles, storage batteries are becoming increasingly common. Among them, lithium-ion batteries are the most widely used type of storage battery due to their advantages such as high voltage, large capacity, long lifespan, low self-discharge rate, and wide operating temperature range.

[0003] Lithium-ion battery fast charging technology can significantly reduce charging time, improving user satisfaction and convenience. Especially in commercial sectors such as taxis, fast charging can greatly improve vehicle operating efficiency and economic benefits. However, current fast charging technology is still limited by battery structure. Utility Model Content

[0004] In view of the above, this application provides a top cover assembly, a battery, and an electrical device to solve at least one problem existing in the prior art.

[0005] To achieve the above objectives, the technical solution of this application is implemented as follows: In a first aspect, embodiments of this application provide a top cover assembly, including: The top cover plate has a first through hole and a second through hole; A first pole and a second pole with opposite polarities, wherein the first pole is installed on the top cover plate through the first through hole, and the second pole is installed on the top cover plate through the second through hole; The first pole post includes: The first column is provided with a plug-in slot, and the bottom of the plug-in slot is provided with a third through hole through which the electrode of the power supply core passes. The second column is provided with a plug-in part, which is configured to be inserted into a plug-in slot to make an electrical connection between the first pole and the electrode tab of the battery cell.

[0006] In one optional embodiment, the inner wall of the insertion slot is provided with a first snap-fit ​​structure, and the outer surface of the insertion part is provided with a second snap-fit ​​structure that cooperates with the first snap-fit ​​structure.

[0007] In one optional embodiment, the first column includes a first contact surface that contacts the tab, and the second column includes a second contact surface that contacts the tab. At least one of the first contact surface and the second contact surface includes a rough surface, and the area of ​​the rough surface accounts for 50%-70%.

[0008] In one optional embodiment, the rough surface includes a plurality of protrusions, the protrusions being one or more of a pyramid, a cone, and a hemisphere, and the height of the protrusions being less than or equal to 1 mm.

[0009] In one optional embodiment, the top cover assembly further includes an upper plastic component, which is sleeved on the outer periphery of the first column; the outer wall of the insertion groove is provided with a first receiving groove that cooperates with the upper plastic component for fixation.

[0010] In an optional embodiment, the top cover assembly further includes a first seal, which is located between the insertion groove and the insertion portion, and the bottom outer edge of the insertion portion is provided with a second receiving groove that cooperates with the first seal for fixation.

[0011] In an alternative embodiment, the top cover assembly further includes a second seal located between the top cover sheet and the pole post; the pole post includes the first pole post and the second pole post.

[0012] Secondly, embodiments of this application provide a battery, comprising: The housing has a first opening and a second opening opposite to each other; A battery cell is disposed within the housing; the battery cell includes a first main body, a first positive electrode and a first negative electrode extending from a first side of the first main body, and a second positive electrode and a second negative electrode extending from a second side of the first main body, the first side and the second side being arranged opposite to each other; A first top cover assembly and a second top cover assembly are used to close the first opening and the second opening, respectively. The first top cover assembly and the second top cover assembly are any of the top cover assemblies described above.

[0013] In one optional embodiment, one of the first positive electrode tab and the first negative electrode tab is electrically connected to the first terminal of the first top cover assembly, and the other is electrically connected to the second terminal of the first top cover assembly; one of the second positive electrode tab and the second negative electrode tab is electrically connected to the first terminal of the second top cover assembly, and the other is electrically connected to the second terminal of the second top cover assembly.

[0014] Thirdly, embodiments of this application provide an electrical device, including any of the batteries described above.

[0015] The top cover assembly, battery, and electrical device provided in this application embodiment include: a top cover sheet with a first through hole and a second through hole; a first terminal and a second terminal with opposite polarities, the first terminal being installed on the top cover sheet through the first through hole, and the second terminal being installed on the top cover sheet through the second through hole; the first terminal includes: a first column with a insertion groove, the bottom of which has a third through hole through which the tab of the power cell passes; and a second column with a insertion part configured to insert into the insertion groove to electrically connect the first terminal and the tab of the power cell. Therefore, the top cover assembly, battery, and electrical device of this application embodiment use a first column and a second column, the first column having a insertion groove and the second column having a insertion part. When they are inserted and mated, the tab is firmly fixed and electrically connected to the first column and / or the second column. Even using a direct connection technology between the tab and the terminal, no welding is required, which reduces contact resistance, increases current, and reduces welding and other process costs. Therefore, the top cover assembly, battery, and electrical device of this application embodiment are not only conducive to fast charging, but also reduce production costs.

[0016] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0017] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings: Figure 1 This is a perspective view of the top cover assembly provided in an embodiment of this application; Figure 2 An exploded view (exploded view) of the top cover assembly provided in an embodiment of this application. Figure 3 for Figure 1 Schematic sectional view along the middle AA direction; Figure 4 for Figure 1 Cross-sectional view along the middle BB direction; Figure 5 A schematic diagram of the first column in the top cover assembly provided in this application embodiment; Figure 6 for Figure 5 A top-down view; Figure 7 for Figure 6 Cross-sectional view along the CC direction; Figure 8 A schematic diagram of the second column in the top cover assembly provided in the embodiments of this application; Figure 9 for Figure 8 A diagram showing the view from below; Figure 10 for Figure 9 Cross-sectional view along the DD direction; Figure 11 A schematic diagram of the battery provided in the embodiments of this application. Figure 1 ; Figure 12 A schematic diagram of the battery provided in the embodiments of this application. Figure 2 ; Figure 13 This is a schematic diagram of a battery cell provided in an embodiment of this application.

[0018] Explanation of reference numerals in the attached figures: 10. Top cover assembly; 11. Top cover piece; 111. First through hole; 112. Second through hole; 12. First pillar; 121. Insertion slot; 122. Third through hole; 123. First snap-fit ​​structure; 13. Second pillar; 131. Insertion part; 132. Rough surface; 133. Second snap-fit ​​structure; 141. First seal; 142. Second seal; 151. Lower plastic part; 152. Upper plastic part; 16. First pillar insulating patch; 20. Housing; 30. Battery cell; 31. Tab. Detailed Implementation

[0019] To make the technical solutions and beneficial effects of this application more obvious and understandable, the technical solutions in the embodiments of this application are clearly and completely described below by listing specific embodiments. Obviously, the embodiments of this application are not exhaustive, and the described embodiments are only some embodiments of this application, not all embodiments.

[0020] The exemplary embodiments disclosed in this application will now be described in more detail with reference to the accompanying drawings, providing detailed structures and steps to illustrate the technical solution of this application. Note that the drawings are not necessarily drawn to scale, and local features may be enlarged or reduced to more clearly show the details of the local features.

[0021] 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 application pertains. The terminology used herein is for the purpose of describing particular embodiments only and should not be construed as limiting the technical solutions of this application.

[0022] The following description provides numerous specific details to offer a more thorough understanding of this application. However, it will be apparent to those skilled in the art that this application can be practiced without one or more of these details. To clearly define the inventive concept of this application and avoid confusion with its content, technical features well-known in the art and conventionally understood by those skilled in the art are not elaborated upon. Specifically, this document does not fully list all features of actual embodiments, nor does it provide a detailed description of well-known functions and structures.

[0023] To address the technical problems in related technologies, embodiments of this application provide a battery top cover. (See reference...) Figure 1 and Figure 2 The battery top cover includes: The top cover plate 11 has a first through hole 111 and a second through hole 112; A first pole and a second pole with opposite polarities, the first pole being installed on the top cover plate 11 through the first through hole 111, and the second pole being installed on the top cover plate 11 through the second through hole 112; The first pole post includes: The first column 12 is provided with a plug-in groove 121, and the bottom of the plug-in groove 121 is provided with a third through hole 122 through which the tab 31 of the power supply core 30 passes (see reference). Figure 5 and Figure 6 ); The second post 13 is provided with a plug-in portion 131, which is configured to be inserted into a plug-in slot 121 to make an electrical connection between the first pole post and the tab 31 of the battery cell 30 (see reference). Figure 4 ).

[0024] Understandably, one of the first and second terminals can be a positive terminal and the other a negative terminal. They are electrically isolated to prevent short circuits. The terminals can be made of copper, aluminum, or their alloys to balance conductivity, strength, and cost.

[0025] The pole and the top cover plate 11 can be fixed by laser welding, riveting or threaded connection.

[0026] The top cover plate 11 is provided with a first through hole 111 and a second through hole 112 for the first pole post and the second pole post to extend out.

[0027] The dimensions of the first through hole 111 and the second through hole 112 can be designed according to the outer diameter of the pole and the assembly tolerances. They are usually set to be 0.1mm–0.3mm larger than the outer diameter of the pole to ensure smooth assembly and facilitate the subsequent installation of the sealing structure. The edges of the through holes can be chamfered or countersunk to avoid stress concentration and provide positioning space for the seal.

[0028] Understandably, refer to Figure 3 and Figure 4 The insertion groove 121 and the insertion part 131 can be a concave-convex fit, and the mating surfaces are pressed together to press the tab 31 passing through the third through hole 122 between the insertion groove 121 and the insertion part 131, so as to realize the electrical connection between the first pole and the tab 31 of the battery cell 30.

[0029] Specifically, the cross-sectional shape of the insertion slot 121 can be circular, rectangular, or polygonal, and its depth is typically 2mm–10mm, sufficient to accommodate the insertion part 131 and provide space for the thickness of the tab 31. The width of the third through hole 122 is slightly larger than the thickness of the tab 31 (e.g., 0.2mm–0.5mm), facilitating the smooth passage of the tab 31.

[0030] Specifically, the cross-sectional shape of the insertion part 131 is the same as that of the insertion groove 121, only slightly different in size, for the purpose of completing the assembly.

[0031] Understandably, the second pole is identical to the first pole except that its polarity is opposite.

[0032] In this embodiment of the battery top cover, the terminal post is provided with a mating insertion slot 121 and an insertion part 131, which are used to electrically connect the tab 31. That is, the tab 31 and the terminal post are directly connected using a direct connection technology, eliminating the need for welding. This reduces contact resistance, increases current, and also reduces the cost of welding and other processes. In short, it is beneficial for fast charging and also reduces production costs.

[0033] Furthermore, the mating of the insertion slot 121 and the insertion part 131 forms a clamping electrical connection structure for the tab 31, with the contact pressure derived from the mating dimensions of the insertion slot 121 and the insertion part 131. Compared to traditional welding, this design reduces the high-temperature heat-affected zone, prevents the tab 31 material from softening due to annealing, and allows for visual inspection of the connection status.

[0034] In some embodiments of this application, the inner wall of the insertion slot 121 is provided with a first snap-fit ​​structure 123, and the outer surface of the insertion part 131 is provided with a second snap-fit ​​structure 133 that cooperates with the first snap-fit ​​structure 123.

[0035] Understandably, compared to screws, rivets, and other methods, snap-fit ​​structures (including the first snap-fit ​​structure 123 and the second snap-fit ​​structure 133) are not only more secure, but also simpler in structure, require no additional parts, and have higher assembly efficiency.

[0036] Specifically, refer to Figure 7 and Figure 10 The snap-fit ​​structure can be a ring boss, a slot, etc., which will not be described in detail.

[0037] In some embodiments of this application, reference is made to Figure 8 and Figure 9 The first column 12 includes a first contact surface that contacts the tab 31, and the second column 13 includes a second contact surface that contacts the tab 31. At least one of the first contact surface and the second contact surface includes a rough surface 132, and the area of ​​the rough surface 132 accounts for 50%-70%.

[0038] Understandably, the rough surface 132 can increase sliding friction, further enhancing the connection strength on the basis of the snap-fit ​​structure. Especially when the battery top cover is used in automotive batteries, the rough surface 132 can effectively suppress the micro-slippage between the tab 31 and the terminal post under the vibration of vehicle driving, prevent oxidation or loosening of the contact surface, and improve long-term reliability.

[0039] Furthermore, the area ratio of the rough surface 132 is 50%-70%, which can significantly increase the sliding friction compared to the ordinary surface, thereby improving the effectiveness of increasing the connection strength.

[0040] In some embodiments of this application, the rough surface 132 includes a plurality of protrusions, the protrusions being one or more of a pyramid, a cone, and a hemisphere, and the height of the protrusions being less than or equal to 1 mm.

[0041] In this way, the appropriate shape can be selected according to the battery's usage scenario. These shapes have low processing costs and do not affect the structural strength of the terminals.

[0042] Understandably, the height of the protrusion is less than or equal to 1 mm, on the one hand to minimize the impact on the structural strength of the pole, and on the other hand to ensure that the rough surface 132 has sufficient wear resistance.

[0043] In some embodiments of this application, reference is made to Figure 3 and Figure 4 The top cover assembly 10 also includes an upper plastic part 152, which is sleeved on the outer periphery of the first column 12; the outer wall of the insertion groove 121 is provided with a first receiving groove that cooperates with the upper plastic part 152 for fixing.

[0044] Understandably, the upper plastic part 152 can improve the insulation performance of the electrode post, such as the creepage distance with other live parts. Furthermore, the upper plastic part 152 can also reduce the axial movement or the magnitude of axial movement of the electrode post relative to the top cover plate 11, thereby improving the stability of the top cover.

[0045] In some embodiments of this application, reference is made to Figure 3 and Figure 4The top cover assembly 10 further includes a first sealing member 141, which is located between the insertion groove 121 and the insertion part 131. The bottom outer edge of the insertion part 131 is provided with a second receiving groove that cooperates with the first sealing member 141 for fixation.

[0046] In this way, when the electrode post and the battery cell 30 are electrically connected, the first sealing member 141 seals the part of the battery cell 30 facing the electrode post that connects to the insertion groove 121, thereby reducing electrolyte leakage.

[0047] In some embodiments of this application, reference is made to Figure 3 and Figure 4 The top cover assembly 10 further includes a second seal 142, which is located between the top cover plate 11 and the pole post; the pole post includes the first pole post and the second pole post.

[0048] Understandably, the second seal 142 can seal the assembly gap between the top cover plate 11 and the terminal post, so that the opening of the core facing the terminal post that connects to the gap is sealed to the outside; on the one hand, it reduces electrolyte leakage, and on the other hand, it reduces the entry of external moisture and dust into the battery.

[0049] Furthermore, the first sealing element 141 and the second sealing element 142 form an overall seal, improving the airtightness of the battery and meeting the IP67 or even IP68 protection level requirements.

[0050] In some embodiments of this application, the top cover assembly 10 further includes a lower plastic part 151, which is sleeved on the outer periphery of the first column 12 below the top cover sheet.

[0051] The lower plastic part 151, along with the upper plastic part 152, can improve the insulation performance of the electrode post, such as the creepage distance to other live parts. The lower plastic part 151, along with the upper plastic part 152, can also reduce the axial movement or amplitude of the electrode post relative to the top cover 11, thus improving the stability of the top cover.

[0052] In some embodiments of this application, the top cover assembly 10 further includes a first column insulating patch 16, which is attached to the bottom end of the first column to separate the electrode post and the battery cell.

[0053] Understandably, the terminals are conductive components, while other parts of the battery cell, besides the tabs, such as the casing, need to be insulated from the terminals. Therefore, the first terminal insulating patch 16 serves as an insulating barrier. Furthermore, the surface of the battery cell is typically quite sensitive; direct hard contact with the metal terminals may cause scratches, indentations, or localized stress concentrations during assembly or vibration, thereby affecting the cell's integrity or triggering an internal short circuit risk. The first terminal insulating patch 16, with its buffering and flexibility, provides mechanical cushioning and surface protection.

[0054] This application also provides a battery, as shown in the embodiments. Figures 11-13 The battery includes: The housing 20 has a first opening and a second opening opposite to each other; A battery cell 30 is disposed within the housing 20; the battery cell 30 includes a first main body, a first positive electrode tab 31 and a first negative electrode tab 31 extending from a first side of the first main body, and a second positive electrode tab 31 and a second negative electrode tab 31 extending from a second side of the first main body, with the first side and the second side arranged opposite to each other. A first top cover assembly 10 and a second top cover assembly 10 are used to close the first opening and the second opening, respectively. The first top cover assembly 10 and the second top cover assembly 10 are the top cover assemblies 10 described above.

[0055] It should be noted that the housing 20 of this application embodiment is provided with two openings (including a first opening and a second opening), and two tabs 31 are provided in each of the two openings, that is, a total of four tabs 31, with electrodes led out from both sides.

[0056] Compared to the single opening and two tabs 31 of a conventional battery, the quad tabs 31 configuration of this embodiment can achieve a uniform current density during the charging process of individual battery cells, thereby further improving the fast charging performance of the battery. Furthermore, it can also improve the 30-rate performance of thick-coated cells.

[0057] In some embodiments of this application, one of the first positive electrode 31 and the first negative electrode 31 is electrically connected to the first terminal of the first top cover assembly 10, and the other is electrically connected to the second terminal of the first top cover assembly 10; one of the second positive electrode 31 and the second negative electrode 31 is electrically connected to the first terminal of the second top cover assembly 10, and the other is electrically connected to the second terminal of the second top cover assembly 10.

[0058] In this embodiment, all four tabs 31 are electrically connected to the electrode post through the cooperation of the aforementioned insertion slots 121 and insertion parts 131. This eliminates the need for welding, reducing contact resistance, increasing current, and lowering the costs associated with welding and other processes.

[0059] This application also provides an electrical device, including the battery described above.

[0060] The aforementioned electrical equipment can include vehicles, portable electronic devices, electric toys, power tools, energy storage devices, amusement equipment, elevators, and lifting equipment. Vehicles can include automobiles, ships, aircraft, and spacecraft; automobiles can be gasoline-powered vehicles, natural gas-powered vehicles, or new energy vehicles, with new energy vehicles including pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles; aircraft include airplanes, balloons, and airships; spacecraft include rockets, space shuttles, and spacecraft; portable electronic devices can include mobile phones, laptops, tablets, and digital cameras; electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, or electric airplane toys; power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers; energy storage devices can be energy storage walls, base station energy storage, and containerized energy storage; amusement equipment can be carousels, free-fall rides, etc. This application does not impose any special restrictions on the aforementioned electrical equipment.

[0061] Therefore, the electrical equipment in this application embodiment uses a direct connection technology between the tabs and terminals, eliminating the need for welding. This reduces contact resistance, increases current, and lowers the costs associated with welding and other processes. This benefits both fast charging and reduced production costs, and the four-tab structure further facilitates fast charging.

[0062] Understandably, prefixes such as "first" and "second" are merely for distinguishing different descriptive objects and do not impose restrictions on the position, order, priority, or value of the descriptive objects. The description of the descriptive objects is found in the context of the claims or embodiments, and the use of prefixes does not constitute unnecessary limitations. For example, the numerical value of the descriptive object is not limited by ordinal numbers and can be one or more. Taking "first device" as an example, the numerical value of "device" can be one or more. Furthermore, the objects modified by different prefixes can be the same or different. For example, if the descriptive object is "device," then "first device" and "second device" can be the same device or different devices, and their types can be the same or different. Describing "first" does not necessarily imply the existence of "second," and discussing "second" does not necessarily imply the existence of "first."

[0063] In some embodiments, unless otherwise stated, elements expressed in the singular form, such as “a,” “the,” “the,” “the,” “the,” “the,” etc., can mean “one and only one,” or “one or more,” “at least one,” etc. For example, when using articles such as “a,” “an,” “the,” etc. in translation, the noun following the article can be understood as either a singular or a plural expression. In some embodiments, “multiple” refers to two or more.

[0064] In some embodiments, unless otherwise expressly defined, the terms "installation," "connection," "linking," "fixing," "setting," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral part; it can be a mechanical connection, an electrical connection, or a communication connection; it can be a direct connection or an indirect connection through an intermediate medium; it can also refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this embodiment according to the specific circumstances.

[0065] In some embodiments, the terms “center,” “longitudinal,” “lateral,” “length,” “width,” “thickness,” “height,” “up,” “down,” “front,” “rear,” “left,” “right,” “vertical,” “horizontal,” “top,” “bottom,” “inner,” “outer,” “clockwise,” and “counterclockwise” indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only used for the purpose of simplifying the description of this application and do not indicate that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. That is, they should not be construed as limitations on this application.

[0066] In some embodiments, unless otherwise expressly defined, "above" or "below" the second feature can mean that the first and second features are in direct contact, or indirect contact via an intermediate medium, or that they are not in contact, but simply indicate that the horizontal level of the first feature is higher than that of the second feature. Furthermore, "above" or "below" the second feature can mean that the first feature is directly above or diagonally above, directly below, or diagonally below the second feature.

[0067] It should be understood that the above embodiments are exemplary and are not intended to encompass all possible implementations of the technical solutions contained in this application. Various modifications and changes can be made to the above embodiments without departing from the scope of this application. Similarly, the various technical features of the above embodiments can be arbitrarily combined to form other embodiments of this application that may not be explicitly described. Therefore, the above embodiments merely illustrate several implementations of this application and do not limit the scope of protection of this patent application.

Claims

1. A top cover assembly, characterized in that, include: The top cover plate (11) has a first through hole (111) and a second through hole (112). A first pole and a second pole with opposite polarities, the first pole being installed on the top cover plate (11) through the first through hole (111), and the second pole being installed on the top cover plate (11) through the second through hole (112). The first pole post includes: The first column (12) is provided with a plug-in groove (121), and the bottom of the plug-in groove (121) is provided with a third through hole (122) through which the tab (31) of the power supply core (30) passes. The second column (13) is provided with a plug-in part (131), which is configured to be inserted into the plug-in slot (121) so that the first pole post and the electrode tab (31) of the cell (30) are electrically connected.

2. The top cover assembly according to claim 1, characterized in that, The inner wall of the insertion slot (121) is provided with a first snap-fit ​​structure (123), and the outer surface of the insertion part (131) is provided with a second snap-fit ​​structure (133) that cooperates with the first snap-fit ​​structure (123).

3. The top cover assembly according to claim 1, characterized in that, The first column (12) includes a first contact surface that contacts the tab (31), and the second column (13) includes a second contact surface that contacts the tab (31). At least one of the first contact surface and the second contact surface includes a rough surface, and the area of ​​the rough surface accounts for 50%-70%.

4. The top cover assembly according to claim 3, characterized in that, The rough surface includes multiple protrusions, the protrusions being one or more of the following shapes: pyramid, cone, and hemisphere, and the height of the protrusions is less than or equal to 1 mm.

5. The top cover assembly according to claim 1, characterized in that, The top cover assembly also includes an upper plastic part (152), which is sleeved on the outer periphery of the first column (12); the outer wall of the insertion groove (121) is provided with a first receiving groove that cooperates with the upper plastic part (152) for fixing.

6. The top cover assembly according to claim 1, characterized in that, The top cover assembly also includes a first sealing element (141), which is located between the insertion groove (121) and the insertion part (131). The bottom outer edge of the insertion part (131) is provided with a second receiving groove that cooperates with the first sealing element (141) for fixing.

7. The top cover assembly according to claim 1, characterized in that, The top cover assembly also includes a second seal (142) located between the top cover plate (11) and the pole post; the pole post includes the first pole post and the second pole post.

8. A battery, characterized in that, include: The housing (20) has a first opening and a second opening opposite to each other; A battery cell (30) is disposed inside the housing (20); the battery cell (30) includes a first main body, a first positive electrode tab (31) and a first negative electrode tab (31) extending from a first side of the first main body, and a second positive electrode tab (31) and a second negative electrode tab (31) extending from a second side of the first main body, the first side and the second side being arranged opposite to each other; A first top cover assembly and a second top cover assembly, the first top cover assembly and the second top cover assembly being used to close the first opening and the second opening respectively, the first top cover assembly and the second top cover assembly being the top cover assembly as described in any one of claims 1-7.

9. The battery according to claim 8, characterized in that, One of the first positive electrode (31) and the first negative electrode (31) is electrically connected to the first terminal of the first top cover assembly, and the other is electrically connected to the second terminal of the first top cover assembly; one of the second positive electrode (31) and the second negative electrode (31) is electrically connected to the first terminal of the second top cover assembly, and the other is electrically connected to the second terminal of the second top cover assembly.

10. An electrical appliance, characterized in that, Includes the battery as described in claim 8 or 9.

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