Cover plate assembly and single-cell battery

Abstract

The present application belongs to the technical field of batteries, and discloses a cover plate assembly and a single-cell battery. The cover plate assembly has a first direction. The cover plate assembly comprises a cover plate, the cover plate being provided with an explosion-proof hole in the first direction; an insulating member, the insulating member being connected to the cover plate in the first direction, and the insulating member being provided with an accommodating slot facing the cover plate; a support member, the support member being disposed in the accommodating slot, and the melting point of the support member being higher than the melting point of the insulating member; and a limiting member, the limiting member being disposed in the accommodating slot and being connected to the insulating member, and the limiting member abutting against the support member in a direction perpendicular to the first direction, so that the support member is fixed in the accommodating slot.

Description

Cover plate assembly and single battery

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on December 29, 2023, with application number 202311862977.X and invention name “A cover assembly and single cell battery”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to, but is not limited to, the field of battery technology, and specifically to a cover plate assembly and a single battery. Background Art

[0003] In addition to the electrode assembly, the battery casing also requires various insulating and fixing structures to stabilize the electrode assembly, and the casing must be enclosed by a top cover. The top cover must be equipped with an explosion-proof structure to promptly relieve pressure in the event of thermal runaway. However, when thermal runaway occurs, the various insulating and fixing structures within the casing are susceptible to melting and disappearing due to the heat. At this time, the electrode assembly is easily moved to the top cover by the high-temperature, high-pressure gas and blocked the explosion-proof structure, causing the battery to catch fire or even explode.

[0004] Application Contents

[0005] In a first aspect, an embodiment of the present application provides a cover plate assembly, the cover plate assembly having a first orientation, the cover plate assembly comprising:

[0006] a cover plate, wherein the cover plate is provided with an explosion-proof hole in the first direction;

[0007] an insulating member connected to the cover plate in the first direction, and the insulating member is provided with a receiving groove toward the cover plate;

[0008] a support member, the support member being disposed in the receiving groove, the melting point of the support member being greater than the melting point of the insulating member;

[0009] A limiting member is provided in the accommodating groove and connected to the insulating member, and the limiting member abuts against the supporting member along a direction perpendicular to the first direction so that the supporting member is fixed to the accommodating groove.

[0010] In some embodiments, the receiving groove has a peripheral wall surrounding the support member and a bottom wall connected to the support member, and the peripheral wall is connected to the bottom wall;

[0011] There are multiple limiting members, and the multiple limiting members are connected to the peripheral wall.

[0012] In some embodiments, a plurality of the limiting members are arranged around the peripheral wall;

[0013] And / or, a plurality of the limiting members are arranged at intervals along the first direction.

[0014] In some embodiments, the limiting member has a corresponding first end and a second end in the first direction, the second end faces the bottom wall, and a first chamfer is provided on a side of the first end facing away from the peripheral wall.

[0015] In some embodiments, the support member has a third end and a fourth end in the first direction, the fourth end faces the bottom wall, and a second chamfer is formed on the circumference of an edge of the fourth end.

[0016] In some embodiments, an orthographic projection of the support member on the cover plate is at least partially located outside the explosion-proof hole.

[0017] In some embodiments, the insulating member is provided with an exhaust hole in the first direction, and the exhaust hole is connected to the explosion-proof hole.

[0018] In some embodiments, the fitting clearance between the support member and the peripheral wall is a mm, satisfying: 0.2 mm ≥ a ≥ 0.1 mm;

[0019] And / or, the size of the limiting member in a direction perpendicular to the peripheral wall is b mm, satisfying: 0.5mm≥b≥0.2mm.

[0020] In some embodiments, a dimension of the support member in the first direction is less than or equal to a depth of the accommodating groove in the first direction.

[0021] In a second aspect, an embodiment of the present application provides a single cell battery, comprising the above-mentioned cover plate assembly, and also comprising a shell and an electrode assembly, wherein the shell has a accommodating cavity and an opening connected to the accommodating cavity, the electrode assembly and the insulating member are arranged in the accommodating cavity, the cover plate is covered on the opening, and the insulating member is located between the cover plate and the electrode assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0023] FIG1 is a schematic diagram of the exploded structure of the cover plate assembly, housing, and electrode assembly of Example 1 of the present application;

[0024] FIG2 is a schematic structural diagram of an insulating member and a supporting member according to Example 1 of the present application;

[0025] FIG3 is a schematic diagram of the exploded structure of the insulating member and the supporting member of Example 1 of the present application;

[0026] FIG4 is a schematic structural diagram of a front view of an opening of an accommodating groove on an insulating member according to Example 1 of the present application;

[0027] FIG5 is a schematic cross-sectional view of the structure along line A-A in FIG4 ;

[0028] FIG6 is an enlarged structural view of part B in FIG5 ;

[0029] FIG7 is a schematic structural diagram of a side of the insulating member facing away from the opening of the receiving groove in Example 1 of the present application;

[0030] FIG8 is a schematic diagram of the exploded structure of the insulating member and the supporting member of Example 2 of the present application;

[0031] FIG9 is a schematic structural diagram of a front view of an opening of an accommodating groove on an insulating member according to Example 2 of the present application;

[0032] FIG10 is a schematic cross-sectional view of the structure along line C-C in FIG9 ;

[0033] FIG11 is an enlarged structural view of portion D in FIG10 .

[0034] Figure markings: 1. Cover plate assembly; 10. Cover plate; 100. Explosion-proof hole; 101. Explosion-proof valve; 102. Pole; 11. Insulator; 110. Receiving groove; 1100. Peripheral wall; 1101. Bottom wall; 111. Structural groove; 112. Exhaust hole; 113. Through hole; 12. Support member; 120. Third end; 121. Fourth end; 122. Second chamfer; 13. Limiting member; 130. First end; 131. Second end; 132. First chamfer; 2. Shell; 20. Receiving cavity; 21. Opening; 22. Side plate; 3. Electrode assembly; 30. Tab; 4. Bottom cover member; X, first direction; Y, second direction; Z, third direction. Modes for Carrying Out the Invention

[0035] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the embodiments described are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative efforts are within the scope of protection of this application.

[0036] In the description of this application, it should be understood that the terms "thickness", "up", "down", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. They 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, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on this application.

[0037] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of technical features indicated. Therefore, features defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "plurality" means two or more, and "at least one" means one, two, or more, unless otherwise specifically defined.

[0038] The applicant noted that in addition to the electrode assembly, various insulating fixing structures need to be provided in the battery shell to stably fix the electrode assembly. Most of the insulating fixing structures are made of plastic materials such as polypropylene, which has a melting point of about 160°C. When the battery experiences thermal runaway, the internal temperature of the battery can reach above 400°C. The various insulating fixing structures in the shell are easily melted and disappear due to heat. At this time, the electrode assembly is easily moved to the battery pressure relief structure under the action of high-temperature and high-pressure gas and blocks the pressure relief structure, thereby causing the battery to catch fire or even explode.

[0039] In view of this, in combination with Figures 1 to 11, an embodiment of the present application provides a cover assembly, which aims to overcome at least one of the above-mentioned technical problems.

[0040] In the following embodiments, a first direction X, a second direction Y, and a third direction Z that intersect each other are introduced, wherein the first direction X is parallel to the thickness direction of the cover assembly 1, the second direction Y is parallel to the length direction of the cover assembly 1, and the third direction Z is parallel to the width direction of the cover assembly 1.

[0041] Example 1:

[0042] 1 and 2 , the cap plate assembly 1 includes a cap plate 10 and an insulating member 11 connecting the cap plates 10 in a first direction X.

[0043] Among them, the cover plate 10 is provided with an explosion-proof hole 100 in the first direction X, and the insulating member 11 is provided with a receiving groove 110 toward the cover plate 10, and a support member 12 is provided in the receiving groove 110. The melting point of the support member 12 is greater than the melting point of the insulating member 11. At the same time, a limit member 13 is also provided in the receiving groove 110, and the limit member 13 is connected to the insulating member 11. The limit member 13 abuts the support member 12 in a direction perpendicular to the first direction X so that the support member 12 is fixed to the receiving groove 110.

[0044] The accommodating groove 110 cooperates with the limiting member 13 to form an abutment positioning for the support member 12, thereby improving the installation convenience of the support member 12. The accommodating groove 110 also reduces the increase in the overall thickness of the cover assembly 1 caused by the support member 12. When the battery has thermal runaway, the insulating member 11 melts under high temperature and gradually loses its supporting effect on the electrode assembly 3 inside the battery. The support member 12 is more resistant to high temperatures than the insulating member 11, and can effectively maintain support between the cover 10 and the electrode assembly 3, preventing the electrode assembly 3 from moving toward the cover 10 and blocking the pressure relief hole, which is conducive to the smooth discharge of high-temperature gas generated by thermal runaway of the battery from the explosion-proof hole 100, thereby improving the safety of the battery.

[0045] It should be noted that the insulating member 11 can be made of plastic material such as polymers such as polypropylene. The insulating member 11 begins to melt at around 160°C. In this embodiment, the support member 12 is designed as a block structure. The support member 12 can be embedded in the receiving groove 110. The support member 12 can be made of a material with a melting point higher than 400°C, such as ceramic material. The melting point of the support member 12 made of ceramic material can be greater than 2000°C, and it can better maintain support between the electrode assembly 3 and the cover plate 10 under high temperature of thermal runaway of the battery.

[0046] In some embodiments, referring to Figures 2 and 3, the receiving groove 110 includes a peripheral wall 1100 surrounding the support member 12 and a bottom wall 1101 connected to the support member 12. The peripheral wall 1100 is connected to the bottom wall 1101. A plurality of limiting members 13 are provided, and the plurality of limiting members 13 are connected to the peripheral wall 1100. It should be noted that in this embodiment, the limiting members 13 are long strips extending perpendicular to the first direction X. When the support member 12 is placed in the receiving groove 110, it is interference-fitted with the plurality of limiting members 13. That is, the support member 12 is stably embedded in the receiving groove 110 and fixed by overcoming the interference resistance of the plurality of limiting members 13 perpendicular to the first direction X.

[0047] Furthermore, in some embodiments, referring to Figure 3, multiple limiting members 13 are arranged around the peripheral wall 1100. In this embodiment, the peripheral wall 1100 has four interconnected surfaces. In order to optimize the arrangement structure of the multiple limiting members 13 and the abutment effect against the support member 12, the multiple limiting members 13 can be evenly distributed on the four surfaces of the peripheral wall 1100.

[0048] Furthermore, to expand the range of action of the stopper 13 abutting the support member 12, multiple stoppers 13 are spaced apart along the first direction X. Specifically, multiple stoppers 13 are arranged along the first direction X on all four surfaces of the peripheral wall 1100. This ensures that multiple abutting ends are provided for each side of the support member 12 facing the peripheral wall 1100, thereby improving the effectiveness of positioning the support member 12. Specifically, in this embodiment, two stoppers 13 are provided on each surface of the peripheral wall 1100. In other embodiments, the number of stoppers 13 can be flexibly increased or decreased based on the dimensions of the insulating member 11 and the support member 12.

[0049] Furthermore, in some embodiments, referring to Figures 2 to 6 , the stopper 13 has corresponding first and second ends 130 and 131 in the first direction X, with the second end 131 facing the bottom wall 1101, and a first chamfer 132 disposed on the side of the first end 130 facing away from the peripheral wall 1100. The first chamfer 132 helps reduce obstruction of the support member 12 by the stopper 13 during the process of guiding the support member 12 into the receiving groove 110.

[0050] Further, referring to Figure 6 , the support member 12 has a third end 120 and a fourth end 121 in the first direction X. The fourth end 121 faces the bottom wall 1101. A second chamfer 122 is defined along the circumference of the edge of the fourth end 121. The second chamfer 122 cooperates with the first chamfer 132 to guide the entire support member 12 into the receiving groove 110, further reducing obstruction of the stopper 13 on the support member 12 and simplifying the installation of the support member 12.

[0051] In some embodiments, referring to Figures 1 to 3, the insulating member 11 and the plurality of limit members 13 can be manufactured by integral molding. During the molding process, the insulating member 11 can form a receiving groove 110 and a structural groove 111. The structural groove 111 can reduce the material usage of the overall insulating member 11 and reduce the overall quality of the insulating member 11. The number of structural grooves 111 can be flexibly adjusted according to the actual size and structural requirements of the insulating member 11. In this embodiment, taking the formation of two structural grooves 111 as an example, the two structural grooves 111 and the receiving groove 110 are arranged in sequence in the second direction Y, and the structural groove 111 is directed toward the explosion-proof hole 100 in the first direction X. The insulating member 11 is provided with an exhaust hole 112 in the first direction X. The exhaust hole 112 is located in the structural groove 111 and is interconnected with the explosion-proof hole 100.

[0052] 1 and 7 , in this embodiment, a plurality of exhaust holes 112 are provided in each structural groove 111, and the plurality of exhaust holes 112 are evenly distributed in the structural groove 111. When thermal runaway occurs in the battery, the high-temperature and high-pressure gas generated inside the battery can be discharged from the exhaust holes 112 toward the explosion-proof hole 100. The plurality of exhaust holes 112 are beneficial for ensuring that the insulating member 11 has sufficient contact area with the electrode assembly 3 while ensuring that the exhaust holes 112 can provide sufficient exhaust efficiency.

[0053] In some embodiments, referring to Figures 1 to 3 , the orthographic projection of the support member 12 on the cover plate 10 is at least partially located outside the explosion-proof hole 100. In this embodiment, taking the example of the misalignment between the formation position of the receiving groove 110 and the position of the explosion-proof hole 100, the corresponding support member 12 is not opposite the explosion-proof hole 100 in the first direction X. This prevents the support member 12 from obstructing the exhaust passage of the explosion-proof hole 100 and also prevents the installation structure of the support member 12 from affecting the installation of structures such as the explosion-proof valve 101 at the explosion-proof hole 100.

[0054] In addition, in other embodiments, if the opening area of ​​the explosion-proof hole 100 is designed to be larger, the accommodating groove 110 can also be partially opposite to the explosion-proof hole 100. At this time, although part of the support member 12 is opposite to the explosion-proof hole 100 in the first direction X, it can still ensure that the explosion-proof hole 100 can release pressure smoothly.

[0055] In some embodiments, referring to Figure 6, the fitting clearance between the support member 12 and the peripheral wall 1100 is a mm, satisfying: 0.2mm≥a≥0.1mm, a can be any one of 0.1mm, 0.11mm, 0.12mm, 0.13mm, 0.14mm, 0.15mm, 0.16mm, 0.17mm, 0.18mm, 0.19mm, 0.2mm, or a range value consisting of any two of them.

[0056] Correspondingly, the size of the limiter 13 in the direction perpendicular to the peripheral wall 1100 is b mm, satisfying: 0.5mm≥b≥0.2mm, and b can be 0.2mm, 0.21mm, 0.22mm, 0.23mm, 0.24mm, 0.25mm, 0.26mm, 0.27mm, 0.28mm, 0.29mm, 0.3mm, 0.31mm, 0.32mm, 0.33mm, 0.34mm, 0.35mm, 0.36mm, 0.37mm, 0.38mm, 0.39mm, 0.4mm, 0.41mm, 0.42mm, 0.43mm, 0.44mm, 0.45mm, 0.46mm, 0.47mm, 0.48mm, 0.50mm, 0.51mm, 0.52mm, 0.53mm, 0.54mm, 0.55mm, 0.56mm, 0.57mm, 0.58mm, 0.59mm, 0.60mm, 0.61mm, 0.62mm, 0.63mm, 0.64mm, 0.65mm, 0.66mm, 0.67mm, 0.68mm, 0.69mm, 0.70mm, 0.71mm, 0.72mm, 0.73mm, 0.74mm The range value is any one of 0.48mm, 0.49mm, 5mm, or any two of them.

[0057] In some embodiments, referring to FIG5 , the dimension of the support member 12 in the first direction X is less than or equal to the depth of the receiving groove 110 in the first direction X. In this embodiment, the dimension of the support member 12 in the first direction X is less than the depth of the receiving groove 110 in the first direction X. Therefore, the addition of the support member 12 does not increase the dimension of the entire cover plate assembly 1 in the first direction X, which helps to avoid affecting the overall size of the battery.

[0058] 2 and 3 , the insulating member 11 is provided with a through hole 113 in the first direction X for the tab 30 to pass through. During the actual assembly process, the through hole 113 is used to allow the tab 30 of the electrode assembly 3 to pass through so as to be electrically connected to the pole 102 on the cover plate 10. In this embodiment, the through hole 113 is located on the side of the accommodating groove 110 in the second direction Y away from the structural groove 111.

[0059] Beneficial effect: The cover plate 10 assembly 1 of the embodiment of the present application includes a cover plate 10, an insulating member 11, a support member 12 and a limit member 13, wherein the cover plate 10 is provided with an explosion-proof hole 100 in the first direction X, the insulating member 11 is connected to the cover plate 10 in the first direction X, the insulating member 11 is provided with a receiving groove 110 toward the cover plate 10, the support member 12 is provided in the receiving groove 110, the melting point of the support member 12 is greater than the melting point of the insulating member 11, the limit member 13 is provided in the receiving groove 110 and connected to the insulating member 11, the limit member 13 abuts against the support member 12 in a direction perpendicular to the first direction X, so that the support member 12 is fixed to the receiving groove 110; the receiving groove 110 cooperates with the limit to form an abutment positioning for the support member 12, thereby improving the installation convenience of the support member 12. The accommodating groove 110 also reduces the increase in the overall thickness of the cover plate 10 assembly 1 caused by the support member 12. When the battery has thermal runaway, the insulating member 11 melts under high temperature and gradually loses its supporting effect on the electrode assembly 3 inside the battery. The support member 12 is more resistant to high temperatures than the insulating member 11, and can effectively maintain support between the cover plate 10 and the electrode assembly 3, preventing the electrode assembly 3 from moving toward the cover plate 10 and blocking the pressure relief hole, which is conducive to the high-temperature gas generated by the thermal runaway of the battery to be discharged smoothly from the explosion-proof hole 100, thereby improving the safety of the battery.

[0060] Correspondingly, this embodiment also provides a single cell.

[0061] 1 , the single cell includes the above-mentioned cover plate assembly 1, and also includes a shell 2 and an electrode assembly 3. The shell 2 has a accommodating cavity 20, and an opening 21 communicating with the accommodating cavity 20 is opened at one end of the shell 2 in the first direction X. The electrode assembly 3 has a pole ear 30 at one end in the first direction X. The electrode assembly 3 and the insulating member 11 are arranged in the accommodating cavity 20, and the pole ear 30 faces the cover plate 10. A pole post 102 is provided on the cover plate 10 relative to the pole ear 30. When the cover plate 10 is covered on the opening 21, the pole ear 30 can pass through the through hole 113 and be electrically connected to the pole post 102. The insulating member 11 is located between the cover plate 10 and the electrode assembly 3, and the support member 12 is arranged between the cover plate 10 and the electrode assembly 3 to form a preset support structure.

[0062] In addition, as shown in FIG1 , a side plate 22 is provided in the shell 2 on one side of the electrode assembly 3 in the second direction Y. The side plate 22 and the insulating member 11 are fixedly connected to the shell 2 as fixing structures of the electrode assembly 3 .

[0063] In addition, in this embodiment, referring to Figure 1, the shell 2 is further provided with a bottom cover 4 at the other end in the first direction X. The structure of the bottom cover 4 is similar to that of the cover plate 10. In this embodiment, it is only used to seal the shell 2 and lead out the electrode. In other embodiments, if the bottom cover 4 is also provided with a pressure relief structure, a support member 12 can also be added between the bottom cover 4 and the electrode assembly 3, so as to ensure that the pressure relief structure at the bottom cover 4 is not blocked by the electrode assembly 3 when thermal runaway occurs in the battery.

[0064] Example 2:

[0065] 8 to 11 , the difference between this embodiment and embodiment 1 is that the limiting member 13 in this embodiment adopts a long strip structure extending along the first direction X, and the dimension of each limiting member 13 perpendicular to the first direction X is larger than the dimension of the limiting member 13 in the first direction X in embodiment 1.

[0066] Similarly, in order to expand the range of action of the limiting member 13 abutting the support member 12, in this embodiment, multiple limiting members 13 can be evenly distributed on the four surfaces of the peripheral wall 1100. In this embodiment, two limiting members 13 are provided on each surface of the peripheral wall 1100, and the two limiting members 13 are spaced apart in a direction perpendicular to the first direction X. As shown in Figures 10 and 11, the first end 130 of the limiting member 13 extends to the opening 21 end of the accommodating groove 110, and the second end 131 extends to the bottom wall 1101. It is ensured that multiple abutting ends are provided for each side of the support member 12 facing the peripheral wall 1100, thereby improving the effect of positioning the support member 12. In addition, in other embodiments, the number of limiting members 13 can be flexibly increased or decreased according to the size of the insulating member 11 and the support member 12.

[0067] The above is a detailed introduction to a cover plate assembly and a single cell provided in the embodiments of the present application, and specific examples are used to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only for the purpose of helping understanding.

[0068] The technical solutions and core ideas of the present application; ordinary technical personnel in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. [Corrected 20.05.2024 in accordance with Rule 91] A cover assembly having a first orientation, the cover assembly comprising: A cover plate, wherein the cover plate is provided with an explosion-proof hole in the first direction; an insulating member, the insulating member being connected to the cover plate in the first direction, and the insulating member being provided with a receiving groove toward the cover plate; A support member, the support member is disposed in the receiving groove, and the melting point of the support member is greater than the melting point of the insulating member; A limiting member is disposed in the accommodating groove and connected to the insulating member, and the limiting member abuts against the supporting member along a direction perpendicular to the first direction so that the supporting member is fixed to the accommodating groove.

2. [Corrected 20.05.2024 as per Rule 91] A cover assembly according to claim 1, wherein: The receiving groove has a peripheral wall surrounding the supporting member and a bottom wall connected to the supporting member, and the peripheral wall is connected to the bottom wall; The limiting members are provided in plurality, and the plurality of limiting members are connected to the peripheral wall.

3. [Corrected 20.05.2024 as per Rule 91] A cover assembly according to claim 2, wherein: A plurality of the limiting members are arranged around the peripheral wall.

4. [Corrected 20.05.2024 as per Rule 91] A cover assembly according to claim 2 or 3, wherein: A plurality of the limiting members are arranged at intervals along the first direction.

5. [Corrected 20.05.2024 as per Rule 91] A cover assembly according to claim 2, wherein: The limiting member has a first end and a second end corresponding to each other in the first direction, the second end faces the bottom wall, and a first chamfer is provided on a side of the first end away from the peripheral wall.

6. [Corrected 20.05.2024 as per Rule 91] A cover assembly according to claim 5, wherein: The support member has a third end and a fourth end in the first direction, the fourth end faces the bottom wall, and a second chamfer is formed in the circumferential direction of an edge of the fourth end.

7. [Corrected 20.05.2024 as per Rule 91] A cover assembly according to claim 1, wherein: The orthographic projection of the support member on the cover plate is at least partially located outside the explosion-proof hole.

8. [Corrected 20.05.2024 as per Rule 91] A cover assembly according to claim 1, wherein: The insulating member is provided with an exhaust hole in the first direction, and the exhaust hole is connected to the explosion-proof hole.

9. [Corrected 20.05.2024 as per Rule 91] A cover assembly according to claim 2, wherein: The matching clearance between the support member and the peripheral wall is a mm, satisfying: 0.2 mm ≥ a ≥ 0.1 mm.

10. [Corrected 20.05.2024 as per Rule 91] A cover assembly according to claim 2 or 9, wherein: The dimension of the limiting member in a direction perpendicular to the peripheral wall is b mm, satisfying: 0.5 mm ≥ b ≥ 0.2 mm.

11. [Corrected 20.05.2024 as per Rule 91] A cover assembly according to claim 1, wherein: The dimension of the support member in the first direction is less than or equal to the depth of the receiving groove in the first direction.

12. [Corrected according to Rule 91 on 20.05.2024] A single cell, comprising: The cover plate assembly according to any one of claims 1 to 11 further includes a housing and an electrode assembly. The housing has a receiving cavity and an opening communicating with the receiving cavity. The electrode assembly and the insulating member are disposed in the receiving cavity. The cover plate covers the opening, and the insulating member is located between the cover plate and the electrode assembly.

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