Top cover assembly, single battery and battery pack

Abstract

The utility model provides a top cover assembly, a single battery and a battery pack, and relates to the technical field of batteries. The top cover assembly comprises a cover plate with a top surface and a bottom surface, an upper insulating part, and a pole penetrating through the cover plate and the upper insulating part. The top surface is provided with a first groove, at least part of the upper insulating part is accommodated in the first groove, one side, facing the bottom surface, of the upper insulating part is provided with a positioning column, the bottom wall of the first groove is provided with a positioning hole, the positioning column penetrates through the positioning hole, and a part of the pole protrudes out of the top surface. The thickness of the cover plate is T0, the depth of the first groove is H1, the depth of the positioning hole is H2, and the formula that (T0-H2) / H1 is larger than or equal to 2 is met. The thickness T0 of the cover plate, the depth H1 of the first groove and the depth H2 of the positioning hole are controlled to meet the condition that (T0-H2) / H1 is larger than or equal to 2, so that the single battery has high vibration resistance and mechanical shock resistance and can pass vibration resistance and mechanical shock resistance tests of the national standard GB38031-2020.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a top cover assembly, a single cell, and a battery pack. Background Technology

[0002] The information disclosed in this background section is intended only to enhance the understanding of the general background of this disclosure and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art.

[0003] The top cover assembly of a single battery cell typically includes a cover plate, terminals, riveting components, and an upper insulating component. The terminals pass through the cover plate and the upper insulating component and are riveted to the riveting components. The height of the exposed terminals is determined by the thickness of the riveting components and the upper insulating component. However, the thickness of the riveting components and the positive / negative upper insulating components is limited by manufacturing processes and safety requirements, which often prevents the height of the exposed terminals from being reduced. Furthermore, under external forces, the exposed terminals and the upper insulating component are prone to relative rotation.

[0004] In related technologies, countersunk holes and positioning holes are provided on the cover plate, with the upper insulating component located inside the countersunk hole. The upper insulating component is provided with a positioning post that is inserted into the positioning hole for limiting. This not only reduces the vertical distance between the upper insulating component and the cover plate, thus reducing the height of the external leakage electrode, but also effectively prevents the external leakage electrode and the upper insulating component from easily rotating relative to each other. However, the above-mentioned countersunk holes and positioning holes on the cover plate will affect the structural performance of the cover plate, thereby affecting the vibration resistance and mechanical resistance of the single cell. Utility Model Content

[0005] In view of this, the purpose of this application is to provide a top cover assembly, a single cell, and a battery pack, which aims to solve the technical problem that the above-mentioned countersunk holes and positioning holes on the cover plate affect the vibration resistance and mechanical resistance of the single cell.

[0006] To achieve the above objectives, the technical solution adopted in this application is as follows:

[0007] In a first aspect, embodiments of this application provide a top cover assembly, comprising:

[0008] A cover plate having a top surface and a bottom surface, wherein a first groove is provided on the top surface;

[0009] An upper insulating member, at least a portion of which is housed in a first groove, a positioning post is provided on the side of the upper insulating member facing the bottom surface, and a positioning hole adapted to the positioning post is provided on the bottom wall of the first groove, the positioning post passing through the positioning hole;

[0010] The electrode post is respectively inserted through the cover plate and the upper insulating member, and a portion of the electrode post protrudes from the top surface;

[0011] The thickness of the cover plate is T0mm, the depth of the first groove is H1mm, and the depth of the positioning hole is H2mm, satisfying: 2≤(T0-H2) / H1.

[0012] In one embodiment of the first aspect, the following condition is satisfied: (T0-H2) / H1≤6.4.

[0013] In one embodiment of the first aspect, at least one of the following three relations is satisfied:

[0014] 1mm≤T0≤4mm;

[0015] 0.3mm ≤ H1 < 1mm;

[0016] 0.4mm≤H2≤2mm.

[0017] In one embodiment of the first aspect, multiple positioning holes and positioning posts are provided, with two adjacent positioning holes spaced apart and two adjacent positioning posts spaced apart, and each positioning post passing through one positioning hole.

[0018] In one embodiment of the first aspect, the top cover assembly has a thickness direction and a projection plane perpendicular to the thickness direction, wherein the orthographic projection area of ​​the first groove on the projection plane and the orthographic projection area of ​​the upper insulating member on the projection plane are both non-circular.

[0019] In one embodiment of the first aspect, the upper insulating member is provided with a first through hole therethrough, the bottom wall of the first groove is provided with a second through hole therethrough, the pole post includes a column and a connector connected together, the connector is located on the bottom surface, the column is respectively inserted through the first through hole and the second through hole, and protrudes from the top surface.

[0020] In one embodiment of the first aspect, the top cover assembly further includes a lower insulating member and an annular seal. The lower insulating member is disposed on the bottom surface, and the connector abuts against the side of the lower insulating member opposite to the bottom surface. The lower insulating member is provided with a third through hole that penetrates it. The third through hole is disposed opposite to the second through hole. The column is respectively disposed through the first through hole, the second through hole, and the third through hole. The annular seal is sleeved on the outer periphery of the column to seal the gap between the wall of the third through hole and the column, and the gap between the wall of the second through hole and the column, respectively.

[0021] In one embodiment of the first aspect, the top cover assembly has a thickness direction and a projection plane perpendicular to the thickness direction, the orthographic projection area of ​​the third through hole on the projection plane is greater than the orthographic projection area of ​​the second through hole on the projection plane, and the annular seal includes a first annular sealing portion and a second annular sealing portion connected to each other, the first annular sealing portion being located at the third through hole and sleeved on the outer periphery of the column, for sealing the gap between the hole wall of the third through hole and the column, and the second annular sealing portion being located at the second through hole and sleeved on the outer periphery of the column, for sealing the gap between the hole wall of the second through hole and the column.

[0022] In one embodiment of the first aspect, the top cover assembly has a thickness direction and a projection plane perpendicular to the thickness direction. The top cover assembly further includes a riveting member. A second groove is provided on the side of the upper insulating member opposite to the bottom surface. The orthographic projection area of ​​the second groove on the projection plane and the orthographic projection area of ​​the riveting member on the projection plane are both non-circular. At least a portion of the riveting member is received in the second groove and riveted to the portion of the pole protruding from the top surface.

[0023] Secondly, embodiments of this application also provide a single battery cell, including a housing, a cell, and a top cover assembly as described in any of the above embodiments. The housing has a receiving cavity and an opening, the cell is disposed in the receiving cavity, the top cover assembly is sealed at the opening, and the terminal post is electrically connected to the cell.

[0024] Thirdly, embodiments of this application also provide a battery pack, including the single battery cells described in the above embodiments.

[0025] The beneficial effects of this application are:

[0026] This application provides a top cover assembly, including a cover plate, an upper insulating member, and a terminal post. A first groove is provided on the top surface of the cover plate, and at least a portion of the upper insulating member is housed within the first groove. Simultaneously, a positioning post is provided on the side of the upper insulating member facing the bottom surface of the cover plate. A positioning hole is provided on the bottom wall of the first groove, and the positioning post passes through the positioning hole. Furthermore, the top cover assembly also satisfies: 2 ≤ (T0 - H2) / H1. Thus, by controlling the thickness T0 of the cover plate, the depth H1 of the first groove, and the depth H2 of the positioning hole to satisfy 2 ≤ (T0 - H2) / H1, the single-cell battery exhibits high vibration resistance and mechanical shock resistance, enabling it to pass the vibration and mechanical shock resistance tests of the national standard GB38031-2020.

[0027] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0028] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 A first-view structural schematic diagram of the top cover assembly is shown in some embodiments of this application;

[0030] Figure 2 An exploded first-view view of the top cover assembly is shown in some embodiments of this application;

[0031] Figure 3 It shows Figure 2 A schematic diagram of the structure of part A;

[0032] Figure 4 This application shows a second-view structural schematic diagram of the top cover assembly in some embodiments;

[0033] Figure 5 A third-view structural schematic diagram of the top cover assembly is shown in some embodiments of this application;

[0034] Figure 6 It shows Figure 5 Schematic diagram of the cross-sectional structure at point BB;

[0035] Figure 7 It shows Figure 5 A schematic diagram of the exploded cross-sectional structure at point BB;

[0036] Figure 8 It shows Figure 5 A schematic diagram of the cross-sectional structure at point CC.

[0037] Explanation of key component symbols:

[0038] 100 - Top cover assembly; 110 - Cover plate; 111 - Top surface; 112 - Bottom surface; 113 - First groove; 114 - Positioning hole; 115 - Second through hole; 116 - Injection hole; 120 - Upper insulating component; 121 - Positioning post; 122 - First through hole; 123 - Second groove; 130 - Pole post; 131 - Post body; 132 - Connector; 140 - Lower insulating component; 141 - Third through hole; 150 - Annular seal; 151 - First annular seal; 152 - Second annular seal; 160 - Riveting component; x - Thickness direction. Detailed Implementation

[0039] 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.

[0040] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0041] Furthermore, 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. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0042] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can 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 application according to the specific circumstances.

[0043] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0044] like Figure 1As shown, an embodiment of this application provides a top cover assembly 100, which relates to the field of battery technology and is mainly applied to individual cells in a battery pack, such as square cells, cylindrical cells, etc.

[0045] like Figure 3 , Figure 4 , Figure 6 and Figure 7 As shown, the top cover assembly 100 provided in this embodiment includes: a cover plate 110, an upper insulating member 120, and a pole post 130.

[0046] The cover plate 110 has a top surface 111 and a bottom surface 112, with a first groove 113 on the top surface 111. At least a portion of the upper insulating member 120 is housed within the first groove 113. A positioning post 121 is provided on the side of the upper insulating member 120 facing the bottom surface 112. A positioning hole 114 adapted to the positioning post 121 is provided on the bottom wall of the first groove 113, and the positioning post 121 passes through the positioning hole 114. A pole post 130 passes through the cover plate 110 and the upper insulating member 120, with a portion of the pole post 130 protruding from the top surface 111. The thickness of the cover plate 110 is T0 (mm), the depth of the first groove 113 is H1 (mm), and the depth of the positioning hole 114 is H2 (mm), satisfying: 2≤(T0-H2) / H1.

[0047] It should be noted that "at least a portion of the upper insulating member 120 is received within the first groove 113" means that either a portion of the upper insulating member 120 is received within the first groove 113, or the entire upper insulating member 120 is received within the first groove 113. The top surface 111 refers to the side surface of the cover plate 110 facing away from the individual battery casing, and the bottom surface 112 refers to the side surface of the cover plate 110 facing the individual battery casing.

[0048] For example, the top cover assembly 100 satisfies at least one of the following three relationships:

[0049] 1) 1mm≤T0≤4mm.

[0050] 2) 0.3mm≤H1<1mm.

[0051] 3) 0.4mm≤H2≤2mm.

[0052] Among them, T0 can be selected from 1mm, 1.2mm, 1.5mm, 2mm, 2.5mm, 2.7mm, 3mm, 3.3mm, 3.8mm, 4mm, etc. H1 can be selected from 0.3mm, 0.4mm, 0.45mm, 0.5mm, 0.58mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, etc. H2 can be selected from 0.4mm, 0.5mm, 0.8mm, 1mm, 1.2mm, 1.5mm, 2mm, etc.

[0053] In this embodiment, by way of example, the battery pack was subjected to vibration and mechanical shock tests in accordance with Clauses 8.2.1 and 8.2.2 of the national standard GB38031-2020. 100 battery packs were taken for each test group and the performance test results of the battery packs in test groups 1-9 are shown in Table 1.

[0054]

[0055] As shown in Table 1, when (T0-H2) / H1 < 2, the height of the pole post 130 protruding from the top surface 111 of the cover plate 110 is relatively large, and the vibration test yield is above 90%, but the mechanical impact test yield is below 80%. When 2 ≤ (T0-H2) / H1 ≤ 6.4, both the vibration test yield and the mechanical impact test yield are above 90%. When (T0-H2) / H1 > 6.4, the height of the pole post 130 protruding from the top surface 111 of the cover plate 110 is relatively small, and both the vibration test yield and the mechanical impact test yield are above 90%. However, compared to (T0-H2) / H1 = 6.4, after (T0-H2) / H1 > 6.4, both the vibration test yield and the mechanical impact test yield show a decreasing trend. Therefore, the top cover assembly 100 provided in this embodiment preferably satisfies: 2 ≤ (T0-H2) / H1 ≤ 6.4.

[0056] It is understood that the top cover assembly 100 provided in this embodiment, by providing a first groove 113 on the top surface 111 of the cover plate 110, allows at least a portion of the upper insulating member 120 to be accommodated within the first groove 113. Simultaneously, a positioning post 121 is provided on the side of the upper insulating member 120 facing the bottom surface 112 of the cover plate 110, and a positioning post 121 is provided on the bottom wall of the first groove 113, allowing the positioning post 121 to pass through the positioning hole 114. Furthermore, the top cover assembly 100 also satisfies: 2≤(T0-H2) / H1, enabling the individual battery cells to have high vibration resistance and mechanical shock resistance (both vibration test yield and mechanical shock test yield are above 90%), and to pass the vibration and mechanical shock resistance tests of the national standard GB38031-2020.

[0057] like Figure 3 and Figure 4As shown, in one embodiment, multiple positioning holes 114 and positioning posts 121 are provided respectively, with two adjacent positioning holes 114 spaced apart and two adjacent positioning posts 121 spaced apart, and each positioning post 121 passing through a positioning hole 114.

[0058] For example, the number of positioning holes 114 and positioning posts 121 can be two, three, four, five, etc., and can be set according to design needs. In this embodiment, by setting multiple positioning holes 114 and multiple positioning posts 121, with each positioning post 121 passing through one positioning hole 114, the relative rotation of the upper insulating member 120 and the cover plate 110 can be restricted, thereby reducing the risk of the electrode post 130 rotating relative to the cover plate 110 and extending the service life of the single battery cell.

[0059] like Figure 3 As shown, in one embodiment, the top cover assembly 100 has a thickness direction x and a projection plane perpendicular to the thickness direction x. The orthographic projection area of ​​the first groove 113 on the projection plane and the orthographic projection area of ​​the upper insulating member 120 on the projection plane are both non-circular. For example, the non-circular shape can be square, elliptical, triangular, etc.

[0060] In this embodiment, the non-circular upper insulating member 120 and the non-circular first groove 113 cooperate to restrict the relative rotation of the upper insulating member 120 and the cover plate 110, thereby reducing the risk of the electrode post 130 rotating relative to the cover plate 110 and extending the service life of the single cell.

[0061] It should be noted that when multiple positioning posts 121 and positioning holes 114 are provided, and the upper insulating part 120 and the first groove 113 are non-circular, the relative rotation of the pole post 130 and the cover plate 110 can be better restricted.

[0062] like Figure 2 and Figure 3 As shown, in one embodiment, the upper insulating member 120 is provided with a first through hole 122 penetrating therethrough, the bottom wall of the first groove 113 is provided with a second through hole 115 penetrating the bottom surface 112, and the pole post 130 includes a column body 131 and a connecting body 132 connected to each other. The connecting body 132 is located on the bottom surface 112, and the column body 131 is respectively provided through the first through hole 122 and the second through hole 115, and protrudes from the top surface 111.

[0063] In this embodiment, the first through-hole 122 and the second through-hole 115 facilitate the post 131 to pass through the cover plate 110 and the upper insulating member 120 and protrude from the top surface 111 of the cover plate 110, thereby improving the assembly efficiency of the upper insulating member 120, the cover plate 110, and the terminal post 130. Simultaneously, the connector 132 facilitates electrical connection with the battery cell inside the single-cell battery casing, thus achieving electrical connection between the terminal post 130 and the battery cell.

[0064] like Figures 3 to 5 ,as well as Figure 8 As shown, the top cover assembly 100 further includes a lower insulating member 140 and an annular sealing member 150. The lower insulating member 140 is disposed on the bottom surface 112. The connecting body 132 abuts against the side of the lower insulating member 140 away from the bottom surface 112. A third through hole 141 is provided on the lower insulating member 140, and the third through hole 141 is disposed opposite to the second through hole 115. The column 131 is respectively disposed through the first through hole 122, the second through hole 115 and the third through hole 141. The annular sealing member 150 is sleeved on the outer periphery of the column 131 to seal the gap between the hole wall of the third through hole 141 and the column 131 and the gap between the hole wall of the second through hole 115 and the column 131 respectively.

[0065] For example, the material of the annular seal 150 can be selected from elastic materials such as rubber, sponge, polyurethane, and silicone.

[0066] In this embodiment, by providing an upper insulating member 120 on the top surface 111 of the cover plate 110 and a lower insulating member 140 on the bottom surface 112 of the cover plate 110, and by using an annular sealing member 150 to seal the gap between the hole wall of the third through hole 141 and the pillar 131 and the gap between the hole wall of the second through hole 115 and the pillar 131, the possibility of contact between the cover plate 110 and the cell and between the cover plate 110 and the terminal post 130 can be reduced, thereby reducing the risk of short circuit during the use of the single cell.

[0067] like Figure 3 As shown, further, the top cover assembly 100 has a thickness direction x and a projection plane perpendicular to the thickness direction x. The orthogonal projection area of ​​the third through hole 141 on the projection plane is larger than the orthogonal projection area of ​​the second through hole 115 on the projection plane. The annular seal 150 includes a first annular sealing part 151 and a second annular sealing part 152 connected to each other. The first annular sealing part 151 is located at the third through hole 141 and is sleeved on the outer periphery of the column 131. The first annular sealing part 151 is used to seal the gap between the hole wall of the third through hole 141 and the column 131. The second annular sealing part 152 is located at the second through hole 115 and is sleeved on the outer periphery of the column 131. The second annular sealing part 152 is used to seal the gap between the hole wall of the second through hole 115 and the column 131.

[0068] In this embodiment, the gap between the wall of the third through hole 141 and the column 131 is sealed by the first annular sealing part 151, and the gap between the wall of the second through hole 115 and the column 131 is sealed by the second annular sealing part 152. On this basis, the orthographic projection area of ​​the third through hole 141 on the projection plane is made larger than the orthographic projection area of ​​the second through hole 115 on the projection plane, so that the edge of the third through hole 141 and the edge of the second through hole 115 are defined as steps, thereby restricting the movement of the annular seal 150 relative to the cover plate 110 along the center line direction of the pole post 130. This increases the stability of the annular seal 150 after assembly, improves the sealing effect, and thus extends the service life of the single battery.

[0069] like Figure 2 and Figure 3 As shown, in one embodiment, the top cover assembly 100 has a thickness direction x and a projection plane perpendicular to the thickness direction x. The top cover assembly 100 also includes a riveting member 160. The upper insulating member 120 has a second groove 123 on the side opposite to the bottom surface 112. The orthographic projection area of ​​the second groove 123 on the projection plane and the orthographic projection area of ​​the riveting member 160 on the projection plane are both non-circular. At least a portion of the riveting member 160 is received in the second groove 123 and riveted to the portion of the pole post 130 protruding from the top surface 111.

[0070] In this embodiment, the non-circular second groove 123, in conjunction with the non-circular riveting member 160, restricts the relative rotation of the riveting member 160 and the upper insulating member 120, thereby reducing the possibility of the terminal post 130 rotating. Simultaneously, after the riveting member 160 is riveted to the terminal post 130, the terminal post 130, the cover plate 110, the upper insulating member 120, and the riveting member 160 form a relatively stable structure. This effectively extends the lifespan of the single-cell battery.

[0071] like Figure 1 and Figure 2 As shown, in one embodiment, the cover plate 110 is provided with an injection hole 116, which penetrates the top surface 111 and the bottom surface 112, so as to inject electrolyte into the casing of the single cell through the injection hole 116 during subsequent production.

[0072] Embodiments of this application also provide a single battery cell, including a casing, a battery cell, and a top cover assembly 100 as described in any of the above embodiments. The casing has a receiving cavity and an opening, the battery cell is disposed within the receiving cavity, the top cover assembly 100 seals the opening, and the terminal post 130 is electrically connected to the battery cell. Simultaneously, embodiments of this application also provide a battery pack, including the single battery cell described in the above embodiments.

[0073] It is understood that since both the individual battery cell and the battery pack have the top cover assembly 100 of any of the above embodiments, they have all the beneficial effects of the top cover assembly 100, which will not be listed and explained one by one here.

[0074] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0075] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A top cover assembly, characterized in that: include: A cover plate (110), the cover plate (110) having a top surface (111) and a bottom surface (112), the top surface (111) being provided with a first groove (113); an upper insulating member (120), at least a portion of the upper insulating member (120) being received in the first groove (113), a positioning column (121) being provided on a side of the upper insulating member (120) facing the bottom surface (112), a positioning hole (114) adapted for the positioning column (121) being provided on the bottom wall of the first groove (113), and the positioning column (121) being passed through the positioning hole (114); A pole (130), the pole (130) being respectively disposed through the cover plate (110) and the upper insulating member (120), and a portion of the pole (130) being disposed protruding from the top surface (111); The thickness of the cover plate (110) is T0 mm, the depth of the first groove (113) is H1 mm, and the depth of the positioning hole (114) is H2 mm, satisfying: 2≤(T0-H2) / H1.

2. The top cover assembly according to claim 1, characterized in that: Satisfies: (T0-H2) / H1≤6.

4.

3. The top cover assembly according to claim 2, characterized in that: Satisfies at least one of the following three relationships: 1mm≤T0≤4mm; 0.3mm≤H1<1mm; 0.4mm≤H2≤2mm.

4. The top cover assembly according to claim 1, characterized in that: A plurality of the positioning holes (114) and the positioning columns (121) are respectively provided, two adjacent positioning holes (114) are arranged at intervals, two adjacent positioning columns (121) are arranged at intervals, and each positioning column (121) is inserted into one positioning hole (114).

5. The top cover assembly according to any one of claims 1 to 4, characterized in that: The top cover assembly has a thickness direction (x) and a projection plane perpendicular to the thickness direction (x), and an orthographic projection area of ​​the first groove (113) on the projection plane and an orthographic projection area of ​​the upper insulating member (120) on the projection plane are both non-circular.

6. The top cover assembly according to any one of claims 1 to 4, characterized in that: The upper insulating member (120) is provided with a first through hole (122) penetrating the upper insulating member (120), the bottom wall of the first groove (113) is provided with a second through hole (115) penetrating the bottom surface (112), the pole (130) comprises a column (131) and a connector (132) connected to each other, the connector (132) is located on the bottom surface (112), the column (131) is respectively penetrated through the first through hole (122) and the second through hole (115), and is arranged to protrude from the top surface (111).

7. The top cover assembly according to claim 6, characterized in that: The top cover assembly also includes a lower insulating member (140) and an annular sealing member (150). The lower insulating member (140) is arranged on the bottom surface (112). The connecting body (132) abuts against a side of the lower insulating member (140) that is away from the bottom surface (112). The lower insulating member (140) is provided with a third through hole (141) passing through it. The third through hole (141) is arranged opposite to the second through hole (115). The column (131) is respectively penetrated through the first through hole (122), the second through hole (115) and the third through hole (141). The annular sealing member (150) is sleeved on the outer periphery of the column (131) for sealing the gap between the hole wall of the third through hole (141) and the column (131) and the gap between the hole wall of the second through hole (115) and the column (131).

8. The top cover assembly according to claim 7, characterized in that: The top cover assembly has a thickness direction (x) and a projection plane perpendicular to the thickness direction (x); the orthographic projection area of ​​the third through hole (141) on the projection plane is greater than the orthographic projection area of ​​the second through hole (115) on the projection plane; the annular seal (150) includes a first annular sealing portion (151) and a second annular sealing portion (152) connected to each other; the first annular sealing portion (151) is located at the third through hole (141) and is sleeved on the outer periphery of the column (131) for sealing the gap between the hole wall of the third through hole (141) and the column (131); the second annular sealing portion (152) is located at the second through hole (115) and is sleeved on the outer periphery of the column (131) for sealing the gap between the hole wall of the second through hole (115) and the column (131).

9. The top cover assembly according to any one of claims 1 to 4, characterized in that: The top cover assembly has a thickness direction (x) and a projection plane perpendicular to the thickness direction (x), and the top cover assembly also includes a rivet (160). A second groove (123) is provided on the side of the upper insulating member (120) facing away from the bottom surface (112), and the orthographic projection area of ​​the second groove (123) on the projection plane and the orthographic projection area of ​​the rivet (160) on the projection plane are both non-circular. At least a portion of the rivet (160) is accommodated in the second groove (123) and is riveted to a portion of the pole (130) protruding from the top surface (111).

10. A single cell battery, characterized in that: The invention comprises a shell, a battery cell and a top cover assembly as claimed in any one of claims 1 to 9, wherein the shell has a receiving cavity and an opening, the battery cell is arranged in the receiving cavity, the top cover assembly is sealed at the opening, and the pole (130) is electrically connected to the battery cell.

11. A battery pack, characterized in that: Comprising the single cell battery as claimed in claim 10.

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