Cover plate assembly and single cell

Abstract

The application provides a cover plate assembly and a single battery. The cover plate assembly comprises a cover plate, an insulating part and a pole, the pole is connected with the cover plate through the insulating part; the cover plate comprises a cover plate body and a first fixing part, the cover plate is provided with a mounting hole penetrating in a first direction, the cover plate body comprises a first surface and a second surface arranged oppositely in the first direction, and the first fixing part extends from the first surface to a direction away from the cover plate body in the first direction; the first direction is the thickness direction of the cover plate body; the pole is at least partially arranged in the mounting hole; the insulating part is at least connected between the first fixing part and the pole; at least one of the cover plate and the pole is formed with an anti-twist structure, one of the anti-twist structure and the insulating part is formed with a groove, the other is formed with a protrusion and is embedded into the groove, and the number of the protrusion and the groove is more than two. The cover plate assembly and the single battery provided by the application can reduce the material cost and the weight of the cover plate assembly and reduce the risk of the twist between the high cover plate and the pole.

Description

Technical Field

[0001] This application relates to the field of battery technology, and more particularly to a cover plate assembly and a single battery cell. Background Technology

[0002] With increasingly fierce cost competition in the lithium battery industry, the cover plate assembly of a single cell is a key component of lithium batteries, and its cost directly affects the overall cost of lithium batteries.

[0003] The cover plate assembly includes a cover plate body and a pole that penetrates and connects to the cover plate body. In order to ensure a reliable connection between the pole and the cover plate body and to have insulation and sealing performance that meets process requirements, a large number of components are set between the cover plate body and the pole. This not only leads to higher material costs for the cover plate assembly, but also has an adverse effect on assembly efficiency. Utility Model Content

[0004] In view of this, the purpose of this application is to provide a cover plate assembly and a single cell to at least partially solve the problem of high cost of the cover plate assembly.

[0005] Based on the above objectives, a first aspect of this application provides a cover plate assembly, comprising: a cover plate, an insulating portion, and a pole post, wherein the pole post and the cover plate are connected via the insulating portion; the cover plate includes a cover plate body and a first fixing portion, the cover plate is provided with a mounting hole extending through a first direction, the cover plate body includes a first surface and a second surface disposed opposite to each other along the first direction, the first fixing portion extending from the first surface in a direction away from the cover plate body along the first direction; the first direction is the thickness direction of the cover plate body; the pole post is at least partially disposed through the mounting hole; the insulating portion is at least connected between the first fixing portion and the pole post; at least one of the cover plate and the pole post forms an anti-torsion structure, one of the anti-torsion structure and the insulating portion forms a groove, and the other forms a protrusion that fits into the groove, wherein the number of the protrusion and the groove are two or more respectively.

[0006] Optionally, the insulating part covers the first fixing part, the anti-torsion structure is disposed on the first surface, and the anti-torsion structure is provided in multiple portions around the central axis of the mounting hole on the outer periphery of the first fixing part.

[0007] Optionally, the anti-torsion structure includes a first groove or a first protrusion.

[0008] Optionally, the first fixing part includes a first extension and a second extension. The first extension extends from the first surface in the first direction away from the cover plate body, and the second extension extends from the first extension toward the central axis of the mounting hole. The first extension is connected between the cover plate body and the second extension. The anti-torsion structure includes a second groove. The second groove is at least disposed on the surface of the second extension facing the second surface, and multiple second grooves are spaced around the central axis of the mounting hole.

[0009] Optionally, the cover plate further includes a second fixing part, which extends from the second surface at least in the direction of the central axis of the mounting hole; the pole includes a pole body and a protrusion disposed circumferentially along the outer wall of the pole body, and the protrusion is located between the first fixing part and the second fixing part in the first direction; the anti-torsion structure is disposed on the surface of the protrusion away from the second fixing part, and a plurality of such structures are disposed at intervals around the central axis of the mounting hole.

[0010] Optionally, the anti-torsion structure includes a third groove or a second protrusion.

[0011] Optionally, the anti-torsion structure includes a second protrusion, and the second protrusion is disposed along the edge of the protrusion near the pole body.

[0012] Optionally, the dimension of the anti-torsion structure along the first direction is H1, where H1 ≥ 0.2 mm; or, The dimension of the anti-torsion structure along the second direction is L1, where L1 ≥ 0.5 mm; the second direction is the radial direction of the mounting hole.

[0013] Optionally, the outer wall of the pole body is provided with a concave-convex structure, and the insulating part is in contact with the concave-convex structure.

[0014] Based on the same inventive concept, a second aspect of this application also provides a single-cell battery, including a housing, an electrode assembly, and a cover assembly as described in the first aspect, wherein the cover assembly is connected to the housing, and the electrode assembly is disposed within the space formed by the cover assembly and the housing.

[0015] As can be seen from the above, the cover plate assembly and single cell provided in this application can achieve an insulated connection between the electrode post and the cover plate by connecting the insulating part with the first fixing part and the terminal post. This can effectively reduce the number of parts in the cover plate assembly, reduce the amount of metal material used in the cover plate assembly, and thus reduce the material cost and weight of the cover plate assembly.

[0016] An anti-torsion structure is provided on at least one of the terminals and the cover plate. After the insulation part and the anti-torsion structure form an interlocking connection, the terminal is prevented from rotating, the risk of sealing ring failure is reduced, and electrolyte leakage is prevented. At the same time, the connection stability between the battery and the terminal is improved, and the risk of individual cells shaking in the module is reduced. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in this application or related technologies, the drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a partial cross-sectional schematic diagram of a single-cell battery with the first structure according to an embodiment of this application; Figure 2 This is a partial top view of the cover plate assembly of the second structure according to an embodiment of this application; Figure 3 for Figure 2 Schematic diagram of the cross section AA; Figure 4 for Figure 3 Enlarged schematic diagram of part B in the middle; Figure 5 The cover plate assembly of the third structure in the embodiments of this application is in Figure 3 Enlarged schematic diagram of part B in the middle; Figure 6 This is a partial schematic diagram of the cover plate of the cover plate assembly with the third structure according to an embodiment of this application; Figure 7 This is a top view of the cover plate of the cover plate assembly with a third structure according to an embodiment of this application. Figure 8 The cover plate assembly of the fourth structure in the embodiments of this application is in Figure 3 Enlarged schematic diagram of part B in the middle; Figure 9 The cover plate assembly of the fifth structure in the embodiments of this application is in Figure 3 Enlarged schematic diagram of part B in the middle; Figure 10 This is a schematic diagram of the pole post of the cover plate assembly of the fifth structure according to an embodiment of this application; Figure 11 This is a top view schematic diagram of the pole of the cover plate assembly of the fifth structure according to an embodiment of this application; Figure 12 The cover plate assembly of the sixth structure in the embodiments of this application is in Figure 3 Enlarged schematic diagram of part B in the middle; Figure 13 The cover plate assembly of the seventh structure in the embodiments of this application is in Figure 3 Enlarged schematic diagram of part B in the middle; Figure 14 This is a schematic diagram of a single-cell battery with a second structure according to an embodiment of this application.

[0019] Explanation of reference numerals in the attached figures: 1000, Cover plate assembly; 100. Cover plate; 110. Cover plate body; 111. Mounting hole; 1111. First end; 1112. Second end; 112. First surface; 113. Second surface; 120. First fixing part; 121. First extension part; 122. Second extension part; 130. Second fixing part; 200. Pole post; 210. Pole post body; 211. Concave-convex structure; 220. Protrusion; 300, lower insulating component; 400, upper insulating component; 500, riveting block; 600, sealing ring; 700, Sealing part; 800, Insulation part; 900. Anti-torsion structure; 910. First groove; 920. First protrusion; 930. Second groove; 940. Third groove; 950. Second protrusion; 2000, housing; 2100, open end; 3000, Electrode assembly. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with specific embodiments and the accompanying drawings.

[0021] It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components described in these embodiments do not limit the scope of this application.

[0022] At the same time, it should be understood that, for ease of description, the dimensions of the various parts shown in the accompanying drawings are not drawn according to actual scale.

[0023] The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the scope of this application and its application or use.

[0024] It should be noted that, unless otherwise defined, the technical or scientific terms used in the embodiments of this application should have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. The terms "first," "second," and similar terms used in the embodiments of this application do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are only used to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0025] Figure 1 A partial cross-sectional schematic diagram of the first type of single-cell battery is shown.

[0026] like Figure 1 In some embodiments, the single battery cell includes a cover assembly 1000 and a housing 2000. The cover assembly 1000 includes a cover body 110, which is provided with a portion along its thickness direction (e.g., ...). Figure 1 A mounting hole 111 (in the Z direction) is provided, and the cover plate body 110 is fitted and connected to the opening end 2100 of the housing 2000, so that the cover plate body 110 and the housing 2000 enclose a space for accommodating the electrode assembly 3000. A lower insulating member 300 is connected to the side of the cover plate body 110 near the electrode assembly 3000, and an upper insulating member 400 is connected to the side of the cover plate body 110 away from the electrode assembly 3000. The cover plate assembly 1000 also includes a pole post 200, which is fitted with a sealing ring 600 and passes through the lower insulating member 300, the cover plate body 110, and the upper insulating member 400. The end of the pole post 200 away from the electrode assembly 3000 extends out of the upper insulating member 400 and is riveted to the riveting block 500. The pole post 200 and the cover plate body 110 press the sealing ring 600 to seal the pole post 200 and the cover plate body 110 through the sealing ring 600, and to insulate the pole post 200 and the cover plate body 110 through the upper insulating member 400 and the lower insulating member 300.

[0027] As can be seen from the foregoing, in this embodiment, in order to achieve an insulated and sealed connection between the pole post 200 and the cover plate body 110, a sealing ring 600 needs to be fitted onto the pole post 200 and a riveting block 500 needs to be connected to the top of the pole post 200. Since the riveting block 500 needs to be made of metal, not only is the material cost high, but it also results in a large overall weight of the cover plate assembly 1000.

[0028] To address the aforementioned issues, embodiments of this application provide cover plate assemblies 1000 with alternative structures.

[0029] Figure 2 A partial top view of the cover plate assembly 1000 with the second structure is shown. Figure 3 Showing Figure 2 A schematic diagram of the cross-section AA in the middle. Figure 4 Showing Figure 3 Enlarged schematic diagram of part B.

[0030] like Figure 2 , Figure 3 and Figure 4 In some embodiments, the cover plate assembly 1000 includes: a cover plate 100, an insulating portion 800, and a terminal post 200, wherein the terminal post 200 is connected to the cover plate 100 via the insulating portion 800; the cover plate 100 includes a cover plate body 110 and a first fixing portion 120, and the cover plate 100 is provided with a fixing portion along a first direction (e.g., Figure 4 The cover plate body 110 includes a mounting hole 111 (through the Z direction) and a first surface 112 and a second surface 113 arranged opposite to each other along a first direction. A first fixing part 120 extends from the first surface 112 in a direction away from the cover plate body 110 along the first direction. The first direction is the thickness direction of the cover plate body 110. The pole post 200 is at least partially inserted through the mounting hole 111. An insulating part 800 is at least connected between the first fixing part 120 and the pole post 200. At least one of the cover plate 100 and the pole post 200 forms an anti-torsion structure 900. One of the anti-torsion structure 900 and the insulating part 800 forms a groove, and the other forms a protrusion that fits into the groove. The number of protrusions and grooves are two or more.

[0031] It should be noted that the free end of the first fixing part 120 forms the first end 1111 of the mounting hole 111, and the free end of the first fixing part 120 is the end of the first fixing part 120 away from the cover plate body 110. The bottom end of the pole post 200 (i.e., the end near the electrode assembly 3000) is used for electrical connection with the tab of the electrode assembly 3000, and the top end is used for electrical connection with an external circuit (e.g., a busbar assembly or a switch).

[0032] For example, along the first direction, the second surface 113 may be connected to the lower insulating member 300.

[0033] For example, a sealing part 700 is connected between the pole post 200 and the cover plate 100.

[0034] For example, the first fixing part 120 and the cover plate body 110 can be connected by welding or integral molding.

[0035] For example, the pole body 210 may be fitted with a sealing part 700. After the pole 200 is inserted into the mounting hole 111, the pole 200 and the cover plate 100 cooperate to squeeze the sealing part 700, so that the sealing part 700 is deformed under pressure to achieve a sealing effect.

[0036] When assembling the cover plate assembly 1000 of this embodiment, the assembled pole post 200 can be inserted into the mounting hole 111. After the pole post 200 moves to a preset position in the mounting hole 111 along the first direction, an insulating part 800 can be formed at least in the mounting hole 111 by injection molding. The pole post 200 and the first fixing part 120 are connected through the insulating part 800 to achieve relative fixation of the pole post 200 and the cover plate 100, forming a reliable connection.

[0037] Compared to the first type of cover plate assembly 1000, the second type of cover plate assembly 1000 eliminates at least the riveting block 500. The insulating part 800, formed by injection molding, simultaneously achieves the functions of fixing the pole post 200 and insulating the pole post 200 from the cover plate 100. Eliminating the connection between the pole post 200 and the riveting block 500 reduces the overall metal material usage of the cover plate assembly 1000, lowering material costs and weight, which is beneficial for mass production.

[0038] In light of the foregoing, the terminal 200 is used to connect to an external circuit. If the terminal 200 is twisted, it may adversely affect the reliability of the connection between the terminal 200 and the external circuit. Furthermore, when the terminal 200 is twisted, it may also adversely affect the sealing performance of the insulation part 800, leading to leakage in the individual battery cells using the cover assembly 1000 of this embodiment.

[0039] To avoid the aforementioned problems, this embodiment forms an anti-torsion structure 900 on at least one of the pole post 200 and the cover plate 100. Figure 4 Taking the structure and orientation shown as an example, the anti-torsion structure 900 is a groove provided on the cover plate 100. Correspondingly, the insulating part 800 forms a protrusion and fits into the groove on the cover plate 100, which enables the insulating part 800 and the cover plate 100 to form a more reliable connection structure, thereby reducing the risk of relative torsion between the cover plate 100 and the insulating part 800. Since the insulating part 800 is connected to both the cover plate 100 and the pole post 200, when the risk of relative torsion between the cover plate 100 and the insulating part 800 is reduced, the risk of torsion between the pole post 200 and the cover plate 100 is also reduced.

[0040] Similarly, if the anti-torsion structure 900 is a groove provided on the pole post 200, and the insulating part 800 forms a protrusion and fits into the groove on the pole post 200, the risk of relative torsion between the pole post 200 and the insulating part 800 can be reduced. Correspondingly, the risk of torsion between the pole post 200 and the cover plate 100 will also be reduced.

[0041] Having two or more protrusions and grooves can further improve the reliability of the anti-torsion structure 900 and ensure a stable connection between the pole post 200, the cover plate 100, and the insulation part 800.

[0042] The cover plate assembly 1000 provided in this embodiment is connected to the first fixing part 120 and the pole post 200 through the insulating part 800, which can make the pole post 200 and the cover plate 100 insulated connection, effectively reducing the number of parts in the cover plate assembly 1000 and reducing the amount of metal material used in the cover plate assembly 1000, thereby reducing the material cost and weight of the cover plate assembly 1000.

[0043] An anti-torsion structure 900 is provided on at least one of the terminal post 200 and the cover plate 100. After the insulating part 800 and the anti-torsion structure 900 form a fitting connection, the terminal post 200 can be prevented from rotating, reducing the risk of failure of the sealing structure (e.g., the sealing part 700) and preventing electrolyte leakage. At the same time, it can improve the connection stability between the external circuit such as the battery pack and the terminal post 200, reducing the risk of individual cells shaking in the module.

[0044] Figure 5 The third type of cover plate assembly 1000 was demonstrated. Figure 3 An enlarged diagram of part B in the middle. Figure 6 This diagram shows a partial schematic of the cover plate 100 of the cover plate assembly 1000 with the third structure. Figure 7 A top view of the cover 100 of the cover assembly 1000 with the third structure is shown.

[0045] like Figure 5 , Figure 6 and Figure 7 In some embodiments, the insulating part 800 covers the first fixing part 120, and the anti-torsion structure 900 is disposed on the first surface 112. The anti-torsion structure 900 surrounds the central axis of the mounting hole 111 on the outer periphery of the first fixing part 120 (e.g., Figure 5 The dotted lines in the text have multiple spacing settings.

[0046] For example, multiple anti-torsion structures 900 are evenly arranged around the mounting hole 111.

[0047] For example, multiple anti-torsion structures 900 disposed on the cover plate body 110 and surrounding the same mounting hole 111 are arranged in a discontinuous ring structure.

[0048] For example, when the anti-torsion structure 900 is disposed on the cover plate body 110, along the second direction (e.g. Figure 5 In the X direction (the second direction is perpendicular to the first direction), the anti-torsion structure 900 can be adjacent to the first fixing part 120 or spaced apart from the first fixing part 120.

[0049] exist Figure 6 and Figure 7 In the structure shown, multiple anti-torsion structures 900 are disposed on the surface of the cover plate body 110, and are located around the central axis of the mounting hole 111 on the outer side of the first fixing part 120 (i.e., on the side of the first fixing part 120 away from the mounting hole 111 along the second direction). The multiple anti-torsion structures 900 can be simultaneously fitted and connected with the insulating part 800, thereby helping to improve the connection strength between the cover plate 100 and the insulating part 800, and further preventing relative torsion between the insulating part 800 and the cover plate 100.

[0050] Specifically, with Figure 5 Taking the structure and orientation shown as an example, if the anti-torsion structure 900 is a groove, when the insulating part 800 is formed by injection molding, the insulating part 800 extends upward from the mounting hole 111 and extends beyond the top of the first fixing part 120 to the outside of the first fixing part 120. When the insulating part 800 extends to the upper plate surface of the cover plate body 110 (i.e., the plate surface close to the first fixing part 120), the insulating part 800 covers the first fixing part 120. At the same time, the insulating part 800 enters the groove provided on the cover plate body 110 as the anti-torsion structure 900. After the insulating part 800 is cured, it can be fitted into the groove and form a reliable connection with the cover plate 100, which can further prevent torsion between the cover plate 100 and the insulating part 800.

[0051] Meanwhile, the insulating portion 800 covers the first fixing portion 120, which not only increases the reliability of the connection between the two and further prevents relative torsion between the terminal post 200 and the cover plate 100, but also improves the insulation performance between the terminal post 200 and the first fixing portion 120, thereby helping to improve the safety performance of the single battery using the cover plate assembly 1000 of this embodiment. In addition, the insulating portion 800 can also cover and protect the first fixing portion 120, preventing deformation or breakage of the first fixing portion 120.

[0052] like Figure 5 In some embodiments, the anti-torsion structure 900 includes a first groove 910.

[0053] It should be noted that, as can be seen from the foregoing, when the anti-torsion structure 900 includes a first groove 910 disposed on the first surface 112, the insulating part 800 covers the first fixing part 120 and forms a protrusion that fits into the first groove 910.

[0054] For example, the first groove 910 can be formed by a stamping process.

[0055] Figure 8 The fourth type of cover plate assembly 1000 was demonstrated. Figure 3 Enlarged schematic diagram of part B.

[0056] like Figure 8 In some embodiments, the anti-torsion structure 900 includes a first protrusion 920.

[0057] It should be noted that, with Figure 8 Taking the structure and orientation shown as an example, when the anti-torsion structure 900 includes a first protrusion 920 disposed on the first surface 112, the insulating part 800 covers the first fixing part 120 and forms a groove at the corresponding position of the first protrusion 920, and the first protrusion 920 is fitted into the groove.

[0058] like Figure 4 In some embodiments, the first fixing part 120 includes a first extension 121 and a second extension 122. The first extension 121 extends along the cover plate body 110 from the first surface 112 in a first direction away from the cover plate body 110. The second extension 122 extends from the first extension 121 to the central axis of the mounting hole 111. The first extension 121 is connected between the cover plate body 110 and the second extension 122. The anti-torsion structure 900 includes a second groove 930. The second groove 930 is at least disposed on the surface of the second extension 122 facing the electrode assembly 3000, and a plurality of second grooves 930 are spaced around the central axis of the mounting hole 111.

[0059] For example, the first extension 121 may include a cylindrical structure, and the second extension 122 may include an annular plate structure.

[0060] For example, the connection between the first extension 121 and the second extension 122 can be welding or integral molding.

[0061] For example, the second groove 930 may extend to the first extension 121.

[0062] It should be noted that during the injection molding process to form the insulating part 800, the injection molding material fills the mounting hole 111 and enters the second groove 930. After the injection molding material cures to form the insulating part 800, a protrusion is formed that fits into the second groove 930, thus forming a reliable connection between the insulating part 800 and the cover plate 100, preventing relative torsion between the two. Multiple second grooves 930 are spaced around the central axis of the mounting hole 111, and correspondingly, multiple protrusions are formed on the insulating part 800. These multiple protrusions of the insulating part 800 simultaneously fit into their respective second grooves 930, further improving the reliability of the connection between the insulating part 800 and the cover plate 100.

[0063] By providing the second groove 930 on the surface of the second extension 122 facing the second surface 113, even if the insulating part 800 is only provided in the mounting hole 111, it can be fitted into the second groove 930, which serves as an anti-torsion structure 900, ensuring a reliable connection between the insulating part 800 and the cover plate 100, and helping to reduce the material cost of the insulating part 800.

[0064] Meanwhile, the second extension 122 of the first fixing part 120 can also be used to limit the pole post 200 along the first direction through the insulating part 800, reducing the risk of the pole post 200 coming out of the mounting hole 111 and helping to improve the connection reliability between the pole post 200 and the cover plate 100.

[0065] Figure 9 The fifth type of cover plate assembly 1000 was demonstrated. Figure 3 Enlarged schematic diagram of part B in the middle; Figure 10 A schematic diagram of the pole post 200 of the fifth type of cover plate assembly 1000 is shown. Figure 11 A top view schematic diagram of the pole post 200 of the cover plate assembly 1000 of the fifth structure is shown.

[0066] like Figure 9 , Figure 10 and Figure 11 In some embodiments, the cover plate 100 further includes a second fixing portion 130, which extends from the second surface 113 at least toward the central axis of the mounting hole 111; the pole post 200 includes a pole post body 210 and a protrusion 220 disposed circumferentially along the outer wall of the pole post body 210, and the protrusion 220 is located between the first fixing portion 120 and the second fixing portion 130 in a first direction; the anti-torsion structure 900 is disposed on the surface of the protrusion 220 away from the second fixing portion 130, and a plurality of such structures are disposed at intervals around the central axis of the mounting hole 111.

[0067] It should be noted that the free end of the second fixing part 130 forms the second end 1112 of the mounting hole 111.

[0068] It should be noted that the outer wall of the pole body 210 is arranged around the central axis of the pole 200.

[0069] For example, the second fixing part 130 and the cover plate body 110 can be connected by welding or integral molding; the connection method between the second fixing part 130 and the cover plate body 110 can be the same as or different from the connection method between the first fixing part 120 and the cover plate body 110.

[0070] In addition to the connection methods described above, the first fixing part 120 and the second fixing part 130 can be connected by welding or integral molding to form a structural component, which is connected to the cover plate body 110 by welding or integral molding.

[0071] For example, the portion of the second fixing part 130 near the cover plate body 110 extends from the second surface 113 in a direction away from the first surface 112, and the portion of the second fixing part 130 near its free end extends in a direction toward the central axis of the mounting hole 111. At this time, the second fixing part 130 may protrude from the second surface 113.

[0072] For example, the second fixing part 130 extends entirely towards the central axis of the mounting hole 111. In this case, the second fixing part 130 can be flush with the second surface 113.

[0073] For example, the protrusion 220 and the second fixing part 130 cooperate to compress the sealing part 700, so that the sealing part 700 is deformed under pressure to achieve a sealing effect.

[0074] For example, the pole body 210 can be a cylinder with a circular cross-section (unless otherwise specified, the cross-sections described below are all cross-sections perpendicular to the central axis of the mounting hole 111), or it can be a cylinder with a polygonal cross-section.

[0075] For example, the outer contour shape of the cross-section of the protrusion 220 may be the same as or different from the cross-sectional shape of the pole body 210.

[0076] For example, along the first direction, the protrusion 220 may be disposed at the middle part of the pole body 210 or near the bottom end (the bottom end of the pole body 210 is near the second surface 113).

[0077] For example, the projections of the protrusion 220 and the second fixing part 130 overlap in the first direction, so that the protrusion 220 of the pole post 200 cannot pass through the inner hole formed by the second fixing part 130. Under the support of the second fixing part 130, the protrusion 220 can be more stably maintained between the second fixing part 130 and the first fixing part 120, reducing the risk of the pole post 200 coming out of the mounting hole 111 and helping to improve the connection reliability between the pole post 200 and the cover plate 100.

[0078] by Figure 9 Taking the structure and orientation shown as an example, the anti-torsion structure 900 is disposed on the upper surface of the protrusion 220 (i.e., the surface away from the second surface 113). When the insulating part 800 is formed by injection molding, the injection molding material will extend downward along the first direction under the action of gravity, so the injection molding material will inevitably come into contact with the anti-torsion structure 900. When the injection molding material cures to form the insulating part 800, it can be fitted and connected with the anti-torsion structure 900, and the insulating part 800 prevents relative torsion between the cover plate 100 and the pole post 200.

[0079] In addition, multiple anti-torsion structures 900 are spaced around the central axis of the mounting hole 111, and the insulating part 800 is simultaneously fitted and connected with multiple anti-torsion structures 900, which can further improve the connection reliability between the insulating part 800 and the pole post 200.

[0080] like Figure 9 , Figure 10 and Figure 11 In some embodiments, the anti-torsion structure 900 includes a third groove 940.

[0081] For example, the third groove 940 can be formed on the protrusion 220 by a stamping process.

[0082] For example, the third groove 940 may extend through the protrusion 220 in the first direction, or it may not extend through the protrusion 220 (i.e., the third groove 940 has a groove bottom).

[0083] For example, the third groove 940 may extend along the second direction from the circumferential sidewall of the protrusion 220 to the circumferential sidewall of the pole body 210; or, the third groove 940 may be spaced apart from the circumferential sidewall of the protrusion 220 and / or the circumferential sidewall of the pole body 210 along the second direction.

[0084] It should be noted that, as can be seen from the foregoing, when the anti-torsion structure 900 includes a third groove 940 provided on the upper surface of the protrusion 220, the insulating part 800 forms a protrusion and fits into the third groove 940.

[0085] A third groove 940 is provided on the upper surface of the protrusion 220, which can expand the gap space between the protrusion 220 and the first fixing part 120, so that the part of the insulating part 800 located between the two has a larger thickness. Correspondingly, it helps to improve the structural strength of the insulating part 800, prevent the insulating part 800 from breaking, and further improve the connection reliability between the insulating part 800, the pole post 200 and the cover plate 100.

[0086] Figure 12 The sixth type of cover plate assembly 1000 was demonstrated. Figure 3 Enlarged schematic diagram of part B.

[0087] like Figure 12 In some embodiments, the anti-torsion structure 900 includes a second protrusion 950.

[0088] It should be noted that, as can be seen from the foregoing, when the anti-torsion structure 900 includes a second protrusion 950 disposed on the upper surface of the protrusion 220, the insulating portion 800 forms a groove corresponding to the second protrusion 950, and the second protrusion 950 is fitted into the groove.

[0089] like Figure 12In some embodiments, the second protrusion 950 is disposed along the edge of the protrusion 220 near the pole body 210.

[0090] In this embodiment, the second protrusion 950 is disposed on the upper surface of the protrusion 220 and is fitted and connected to the outer wall of the pole body 210. In other words, the second protrusion 950 is disposed at the corner position between the pole body 210 and the protrusion 220. It can be understood that, in addition to cooperating with the insulating part 800 to achieve the anti-torsion function, the second protrusion 950 can also act as a reinforcing rib, structurally strengthening the aforementioned corner position and improving the connection reliability between the pole body 210 and the protrusion 220.

[0091] like Figure 4 , Figure 5 , Figure 8 , Figure 9 and Figure 12 In some embodiments, the dimension of the anti-torsion structure 900 along the first direction is H1, where H1 ≥ 0.2 mm.

[0092] For example, H1 can be 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.2mm, 1.4mm, 1.5mm, 1.6mm, 1.8mm or 2mm.

[0093] When the anti-torsion structure 900 is a groove (e.g., a first groove 910, a second groove 930, or a third groove 940), if H1 is too small, there will be fewer insulating parts 800 embedded in the groove, resulting in lower connection strength between the insulating part 800 and the cover plate 100 or between the insulating part 800 and the pole post 200, leading to poor reliability. Under external force, the pole post 200 and the cover plate 100 may move relative to each other, failing to achieve the anti-torsion function.

[0094] When the anti-torsion structure 900 is a protrusion (e.g., a first protrusion 920 or a second groove 950), if H1 is too small, the depth to which the protrusion fits into the insulating part 800 will be small, resulting in lower connection strength between the insulating part 800 and the cover plate 100 or between the insulating part 800 and the pole post 200, leading to poor reliability. Under external force, the pole post 200 and the cover plate 100 may move relative to each other, failing to achieve the anti-torsion function.

[0095] To avoid the above problems, this embodiment designs H1 to be ≥ 0.2 mm, thereby making the connection strength of the insulating part 800 and the anti-torsion structure 900 high, ensuring that the pole post 200 can form a reliable connection with the cover plate 100, and preventing relative torsion between the pole post 200 and the cover plate 100.

[0096] like Figure 4 , Figure 5 , Figure 8 , Figure 9 and Figure 12 In some embodiments, the dimension of the anti-torsion structure 900 along the second direction is L1, where L1 ≥ 0.5 mm; the second direction is the radial direction of the mounting hole 111.

[0097] For example, L1 can be 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.2mm, 1.4mm, 1.5mm, 1.6mm, 1.8mm or 2mm.

[0098] When the anti-torsion structure 900 is a groove, if L1 is too small, there will be fewer insulating parts 800 embedded in the groove, resulting in lower connection strength between the insulating part 800 and the cover plate 100 or between the insulating part 800 and the pole post 200, leading to poor reliability. Under external force, the pole post 200 and the cover plate 100 may move relative to each other, failing to achieve the anti-torsion function.

[0099] When the anti-torsion structure 900 is a protrusion, if L1 is too small, although the protrusion can fit into the groove formed by the insulating part 800, it is easy for the protrusion to slip out of the insulating part 800 when subjected to torsional force, causing relative movement between the pole post 200 and the cover plate 100. At the same time, the protrusion itself may have poor structural strength and is prone to breakage under external force, resulting in failure.

[0100] To avoid the aforementioned problems, this embodiment designs L1 to be ≥ 0.5mm, resulting in a high connection strength between the insulating part 800 and the anti-torsion structure 900. This ensures a reliable connection between the pole post 200 and the cover plate 100, preventing relative torsion between them. Simultaneously, it also prevents the anti-torsion structure 900 from breaking, ensuring its stable and reliable anti-torsion function.

[0101] Figure 13 The seventh type of cover plate assembly 1000 was demonstrated. Figure 3 Enlarged diagram of part B.

[0102] like Figure 13 In some embodiments, the outer wall of the pole body 210 is provided with a concave-convex structure 211, and the insulating part 800 is in contact with the concave-convex structure 211.

[0103] For example, the convex-concave structure 211 may include knurling.

[0104] For example, the knurling pattern can be a vertical stripe pattern, a grid pattern, an array of distributed patterns, or a disordered pattern.

[0105] The uneven structure 211 on the outer wall of the pole body 210 can increase the surface roughness of the area. When the insulating part 800 is formed by injection molding, the insulating part 800 can contact and connect with the uneven structure 211, thereby increasing the connection strength between the insulating part 800 and the pole 200, ensuring that the insulating part 800 can achieve a stable and reliable connection with the pole 200, and further preventing relative torsion between the pole 200 and the cover plate 100.

[0106] Figure 14 A schematic diagram of the second type of single-cell battery structure is shown.

[0107] like Figure 14 and Figure 4 The single cell includes a housing 2000, an electrode assembly 3000, and a cover assembly 1000 as described in the above embodiments. The cover assembly 1000 is connected to the housing 2000, and the electrode assembly 3000 is disposed within the space formed by the cover assembly 1000 and the housing 2000.

[0108] It should be noted that the end of the pole post 200 of the cover plate assembly 1000 that is close to the electrode assembly 3000 can be exposed in the space where the electrode assembly 3000 is located, so that the pole post 200 and the tab of the electrode assembly 3000 can be electrically connected.

[0109] It should be noted that some embodiments of this application have been described above. Other embodiments are within the scope of the appended claims.

[0110] The various embodiments in this application are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0111] The description in this application is given for illustrative purposes and is not intended to be exhaustive or to limit the application to the forms disclosed. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described to better illustrate the principles and practical application of this application and to enable those skilled in the art to understand this application and design various embodiments with various modifications suitable for a particular purpose.

[0112] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of this application is limited to these examples; under the concept of this application, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of different aspects of the embodiments of this application as described above, which are not provided in detail for the sake of brevity.

[0113] Although this application has been described in conjunction with specific embodiments thereof, many substitutions, modifications and variations of these embodiments will be apparent to those skilled in the art from the foregoing description.

[0114] The embodiments of this application are intended to cover all such substitutions, modifications, and variations that fall within the broad scope of this application. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the embodiments of this application should be included within the protection scope of this application.

Claims

1. A cover plate assembly, characterized in that, include: A cover plate, an insulating part, and an electrode post, wherein the electrode post is connected to the cover plate through the insulating part; The cover plate includes a cover plate body and a first fixing part. The cover plate is provided with a mounting hole that runs through a first direction. The cover plate body includes a first surface and a second surface that are arranged opposite to each other along the first direction. The first fixing part extends from the first surface along the first direction in a direction away from the cover plate body. The first direction is the thickness direction of the cover plate body. The pole post is at least partially inserted through the mounting hole; the insulating part is at least connected between the first fixing part and the pole post; At least one of the cover plate and the pole post has an anti-torsion structure, one of the anti-torsion structure and the insulating part has a groove, and the other has a protrusion that fits into the groove, and the number of the protrusion and the groove are two or more.

2. The cover plate assembly according to claim 1, characterized in that, The insulating part covers the first fixing part, the anti-torsion structure is disposed on the first surface, and the anti-torsion structure is provided in multiple places around the central axis of the mounting hole on the outer periphery of the first fixing part.

3. The cover plate assembly according to claim 2, characterized in that, The anti-torsion structure includes a first groove or a first protrusion.

4. The cover plate assembly according to claim 1, characterized in that, The first fixing part includes a first extension and a second extension. The first extension extends from the first surface in the first direction away from the cover plate body, and the second extension extends from the first extension toward the central axis of the mounting hole. The first extension is connected between the cover plate body and the second extension. The anti-torsion structure includes a second groove. The second groove is at least disposed on the surface of the second extension facing the second surface, and multiple second grooves are spaced around the central axis of the mounting hole.

5. The cover plate assembly according to claim 1, characterized in that, The cover plate further includes a second fixing part, which extends from the second surface at least in the direction of the central axis of the mounting hole; the pole post includes a pole post body and a protrusion disposed circumferentially along the outer wall of the pole post body, and the protrusion is located between the first fixing part and the second fixing part in the first direction; The anti-torsion structure is disposed on the surface of the protrusion away from the second fixing part, and multiple such structures are provided at intervals around the central axis of the mounting hole.

6. The cover plate assembly according to claim 5, characterized in that, The anti-torsion structure includes a third groove or a second protrusion.

7. The cover plate assembly according to claim 5, characterized in that, The anti-torsion structure includes a second protrusion, and the second protrusion is disposed along the edge of the protrusion near the pole body.

8. The cover plate assembly according to claim 1, characterized in that, The dimension of the anti-torsion structure along the first direction is H1, where H1 ≥ 0.2 mm; or, The dimension of the anti-torsion structure along the second direction is L1, where L1 ≥ 0.5 mm; the second direction is the radial direction of the mounting hole.

9. The cover plate assembly according to claim 5, characterized in that, The outer wall of the pole body is provided with a concave-convex structure, and the insulating part is in contact with the concave-convex structure.

10. A single-cell battery, characterized in that, It includes a housing, an electrode assembly, and a cover plate assembly as described in any one of claims 1 to 9, wherein the cover plate assembly is connected to the housing, and the electrode assembly is disposed within the space formed by the cover plate assembly and the housing.

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