Cover plate assembly and single cell

Abstract

This application provides a cover plate assembly and a single battery cell. The cover plate assembly includes: a terminal post, comprising a terminal post body and a protrusion circumferentially disposed along the outer wall of the terminal post body, wherein a corner is formed between the terminal post body and the protrusion; a sealing ring, fitted onto the terminal post body and extending at least to the corner, the sealing ring having a groove circumferentially disposed, the groove being opposite to the corner; in a first state, the groove and the corner are spaced apart; in a second state, the groove is fitted to the corner. The cover plate assembly and single battery cell provided in this application help improve the sealing performance of the cover plate assembly.

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 market, the cover assembly of a single cell is a key component. The cover assembly consists of a cover body and terminals that penetrate and connect to the cover body. The terminals and the cover body not only need to be insulated from each other, but also need to have good sealing performance. Otherwise, the single cell may experience problems such as electrolyte leakage, which will adversely affect the safety performance of the single cell. Utility Model Content

[0003] 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 insufficient sealing performance of the cover plate assembly.

[0004] To achieve the above objectives, a first aspect of this application provides a cover plate assembly, comprising: a pole, including a pole body and a protrusion disposed circumferentially along the outer wall of the pole body, wherein a corner is formed between the pole body and the protrusion; a sealing ring, fitted onto the pole body and extending at least to the corner, wherein the sealing ring has a groove disposed circumferentially, the groove being opposite to the corner; when the sealing ring is in a first state, the groove is spaced apart from the corner; when the sealing ring is in a second state, the groove is fitted with the corner.

[0005] Optionally, the sealing ring includes a first segment and a second segment connected to each other, the first segment fitting with the protrusion, the second segment fitting with the pole body, and the groove being disposed between the first segment and the second segment.

[0006] Optionally, the corner is rounded.

[0007] Optionally, when the sealing ring is in the first state, the groove is a right angle or an oblique angle; the radius of the rounded corner is R1, the dimension of the groove along the first direction is H1, and the dimension along the second direction is L1, H1≥R1, and L1≥R1; the central axis of the pole extends along the first direction, and the second direction is perpendicular to the first direction.

[0008] Optionally, the cover plate assembly further includes a cover plate, the cover plate body including a first surface and a second surface disposed opposite to each other along a first direction; the central axis of the pole extends along the first direction; the cover plate includes a cover plate body and a second fixing part, the cover plate is provided with a mounting hole extending through along the first direction, the second fixing part extends from the second surface at least in the direction of the central axis of the mounting hole; the pole is at least partially inserted through the mounting hole; the protrusion is located on the side of the second fixing part closer to the first surface, and the sealing ring is disposed between the protrusion and the second fixing part.

[0009] Optionally, the free end of the second fixing part has a rounded corner at least on the side closest to the first surface along the first direction; or, The cover plate further includes a first fixing portion, which extends from the first surface in a direction away from the cover plate body along the first direction; along the first direction, the protrusion is located between the first fixing portion and the second fixing portion; or... The cover plate assembly further includes an insulating portion that engages with the sealing ring and is located between the cover plate and the pole post, so that the cover plate and the pole post are insulated from each other.

[0010] Optionally, the outer wall of the pole body is provided with an annular positioning groove; the second segment is fitted into the positioning groove.

[0011] Optionally, the pole body includes a bottom portion located along a first direction on the side of the positioning groove away from the protrusion; the central axis of the pole extends along the first direction; the projection of the bottom portion along the first direction covers the projection of the bottom of the positioning groove along the first direction; or, The second segment fits into the bottom of the positioning groove; or, Along the first direction, the size of the positioning groove is H3, the size of the second segment is H4, and H4 ≤ H3; the central axis of the pole extends along the first direction.

[0012] Optionally, the sealing ring is adhesively bonded to the outer wall of the pole body; or, The sealing ring is interference-fitted with the pole body, and the interference amount is ≥0.05mm; or, The sealing ring includes a second section surrounding the pole body; the inner wall of the second section fits against the outer wall of the pole body, and at least one of the inner wall of the second section and the outer wall of the pole body has a concave-convex structure.

[0013] 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.

[0014] As can be seen from the above, the cover plate assembly and single battery provided in this application have grooves on the sealing ring corresponding to the corners, so that the sealing ring can be spaced between the grooves and the corners in its natural state, thereby ensuring that when the sealing ring is in a compressed state after the cover plate assembly is assembled, the sealing ring and the corners fit tightly together, improving the sealing effect. Attached Figure Description

[0015] 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.

[0016] Figure 1 This is a partial cross-sectional schematic diagram of the pole post with a sealing ring according to the first structure of this application embodiment; 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; Figure 5 This is a partial cross-sectional view of the pole and the sealing ring in their natural state for the cover plate assembly of the second structure according to an embodiment of this application. Figure 5a This is a schematic diagram of the sealing ring of the cover plate assembly with the second structure according to an embodiment of this application; Figure 5b This is a partial cross-sectional schematic diagram of the sealing ring of the cover plate assembly with the second structure according to an embodiment of this application; Figure 6 This is a partial cross-sectional schematic diagram of the pole and the sealing ring in their natural state of the cover plate assembly of the third structure according to an embodiment of this application. Figure 6a This is a schematic diagram of the sealing ring of the cover plate assembly with a third structure according to an embodiment of this application; Figure 6b This is a partial cross-sectional schematic diagram of the sealing ring of the cover plate assembly with the third structure according to an embodiment of this application; Figure 7 The cover plate assembly of the fourth structure in the embodiments of this application is in Figure 3 Enlarged schematic diagram of part B; Figure 8 This is a partial cross-sectional schematic diagram of the pole and the sealing ring in their natural state of the cover plate assembly of the fourth structure according to an embodiment of this application. Figure 9 This is a schematic diagram of the pole of the cover plate assembly with the fourth structure according to an embodiment of this application; Figure 10 This is a partial cross-sectional schematic diagram of the pole post of the cover plate assembly of the fourth structure in this application embodiment; Figure 11 This is a partial cross-sectional schematic diagram of the sealing ring of the cover plate assembly with the fourth structure according to an embodiment of this application; Figure 12 This is a schematic diagram of a single battery cell according to an embodiment of this application.

[0017] 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; 130. Second fixing part; 200, pole post; 210, pole post body; 211, bottom part; 220, protrusion; 230, corner; 240, positioning groove; 300, lower insulating component; 400, insulating part; 500, insulating sealing ring; 600, sealing ring; 610, groove; 620, second section; 630, first section; 2000, casing; 3000, Electrode assembly. Detailed Implementation

[0018] 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.

[0019] 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.

[0020] 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.

[0021] 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.

[0022] 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.

[0023] Figure 1 A partial cross-sectional view of the pole post 200 of the first structure, equipped with an insulating sealing ring 500, is shown.

[0024] like Figure 1 In some embodiments, 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 an angle 230 is formed between the pole post body 210 and the protrusion 220.

[0025] The applicant's research found that, for the insulating sealing ring 500 fitted onto the pole body 210, in order to make the insulating sealing ring 500 adapt to the corner 230, the insulating sealing ring 500 can be made to conform to the shape of the corner 230, so that the insulating sealing ring 500 can fit against the protrusion 200, the corner 230 and the outer wall of the pole body 210 in a natural state.

[0026] However, when the pole post 200 is assembled onto the cover plate body 110, the protrusion 220 will compress the insulating sealing ring 500. After the insulating sealing ring 500 is compressed, there will be material redundancy in the area corresponding to the corner 230, causing interference between the insulating sealing ring 500 and the corner 230. After being compressed by the corner 230, the insulating sealing ring 500 will be subjected to radial outward force, affecting the sealing effect of the insulating sealing ring 500.

[0027] To address the aforementioned issues, embodiments of this application provide cover plate assemblies 1000 with alternative structures.

[0028] Figure 2 This shows a partial top view of the cover plate assembly 1000 with the second structure. Figure 3 Showing Figure 2 Schematic diagram of the cross section AA in the middle. Figure 4 Showing Figure 3 An enlarged diagram of part B in the middle. Figure 5 A partial cross-sectional view of the pole post 200 and the sealing ring 600 in their natural state is shown for the cover plate assembly 1000 of the second structure.

[0029] like Figure 2 , Figure 3 , Figure 4 and Figure 5 In some embodiments, the cover plate assembly 1000 includes: a pole post 200, including a pole post body 210 and a protrusion 220 circumferentially disposed along the outer wall of the pole post body 210, and a corner 230 is formed between the pole post body 210 and the protrusion 220; a sealing ring 600, fitted onto the pole post body 210 and extending at least to the corner 230, the sealing ring 600 having a groove 610 circumferentially disposed, the groove 610 being positioned opposite to the corner 230; when the sealing ring 600 is in a first state, the groove 610 and the corner 230 are spaced apart; when the sealing ring 600 is in a second state, the groove 610 is engaged with the corner 230.

[0030] It should be noted that the outer wall of the pole body 210 surrounds the central axis of the pole 200 (e.g., Figure 4 (Dotted / dash lines) settings.

[0031] It should be noted that when the sealing ring 600 is in the first state, it is not compressed. When the sealing ring 600 is in the second state, it is deformed by compression from at least the protrusion 220.

[0032] 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 pole 200), or it can be a cylinder with a polygonal cross-section.

[0033] 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.

[0034] For example, one end of the electrode body 210 is used for electrical connection to the tab of the electrode assembly 3000, and the other end is used for electrical connection to an external circuit (e.g., a busbar assembly or a power strip).

[0035] For example, the material of the sealing ring 600 may include an elastic insulating material, such as rubber or plastic.

[0036] For example, the inner diameter of the sealing ring 600 may be greater than the outer diameter of the corresponding portion of the pole body 210; or, the inner diameter of the sealing ring 600 may be equal to the outer diameter of the corresponding portion of the pole body 210; or, the inner diameter of the sealing ring 600 may be less than the outer diameter of the corresponding portion of the pole body 210.

[0037] by Figure 5 Taking the structure and orientation shown as an example, the groove 610 of the sealing ring 600 can be located only at the position corresponding to the corner 230. After the sealing ring 600 is fitted onto the pole body 210, the groove 610 corresponds to the corner 230. When the sealing ring 600 is in the first state, it can be ensured that the sealing ring 600 can be spaced apart from the corner 230 to avoid interference. As for the top surface of the sealing ring 600 and the bottom surface of the protrusion 220, the two planes can achieve a tight fit and have a large contact area.

[0038] like Figure 4 and Figure 5 After the protrusion 220 compresses the sealing ring 600, the sealing ring 600 is in the second state, the groove 610 moves toward the corner 230 and deforms with the shape of the corner 230 so as to make the groove 610 of the sealing ring 600 fit with the corner 230.

[0039] The cover plate assembly 1000 provided in this embodiment has a groove 610 on the sealing ring 600 corresponding to the corner 230. This allows the sealing ring 600 to be spaced apart from the corner 230 through the groove 610 in its natural state. This ensures that after the cover plate assembly 1000 is assembled, when the sealing ring 600 is in its second state, it is tightly fitted to the corner 230, improving the sealing effect. This helps improve the safety performance of individual batteries using the cover plate assembly 1000 of this embodiment, preventing problems such as electrolyte leakage.

[0040] like Figure 5 In some embodiments, the sealing ring 600 includes a first segment 630 and a second segment 620 connected to each other. The first segment 630 fits against the protrusion 220, the second segment 620 fits against the pole body 210, and the groove 610 is disposed between the first segment 630 and the second segment 620.

[0041] It should be noted that the surface of the first segment 630 that fits with the protrusion 220 is an annular plane, and the surface of the second segment 620 that fits with the pole body 210 is a cylindrical surface around the central axis of the sealing ring 600.

[0042] As described above, the corner 230 is located between the protrusion 220 and the pole body 210. To ensure that the groove 610 corresponds to the corner 230, the groove 610 is positioned between the first segment 630 and the second segment 620 of the sealing ring 600. After the sealing ring 600 is fitted onto the pole 200, the first segment 630 fits against the protrusion 220, and the second segment 620 fits against the pole body 210. Accordingly, the groove 610 located between the first segment 630 and the second segment 620 corresponds to the corner 230.

[0043] like Figure 4 In some embodiments, the corner 230 is rounded.

[0044] If a sharp edge is formed at the corner 230, stress concentration will easily occur at the corner 230, and there is a risk of cracks or even breakage at the connection between the protrusion 220 and the pole body 210.

[0045] To avoid the above problems, this embodiment provides a rounded corner at the corner 230 to make the pole body 210 and the protrusion 220 form a smoother transition, reducing the risk of large stress concentration at the corner 230, which helps to improve the connection reliability between the protrusion 220 and the pole body 210, and prevents cracks or even breakage at the corner 230.

[0046] Figure 5a A schematic diagram of the sealing ring 600 of the cover plate assembly 1000 with the second structure is shown. Figure 5b A partial cross-sectional view of the sealing ring 600 of the cover plate assembly 1000 with the second structure is shown.

[0047] like Figure 5 , Figure 5a and Figure 5b In some embodiments, when the sealing ring 600 is in the first state, the groove 610 is a right angle; the radius of the rounded corner is R1, and the groove 610 is along the first direction (e.g., Figure 5 The dimension of the second direction (in the Z direction) is H1, and the dimension of the second direction (as shown in the second direction) is H1. Figure 5 and Figure 5b The dimension of the pole post 200 (in the X direction) is L1, H1≥R1, and L1≥R1; the central axis of the pole post 200 extends along the first direction, and the second direction is perpendicular to the first direction.

[0048] For example, H1 and L1 can be equal or unequal.

[0049] When the corner 230 is rounded, the rounded corner extends both along the second direction on the protrusion 220 and along the first direction on the outer wall of the pole body 210. Therefore, the groove 610 needs to avoid both the portion of the rounded corner on the protrusion 220 and the portion on the pole body 210.

[0050] Based on this, combined Figure 5 and Figure 5bIn this embodiment, L1 is limited to L1≥R1, which ensures that the rounded corners on the pole body 210 are all located inside the groove 610, ensuring that the first segment 630 can fit with the bottom surface of the protrusion 220. Thus, after the pole 200 is installed into the mounting hole 111, the bottom surface of the protrusion 220 can effectively compress the first segment 630 of the sealing ring 600, thereby ensuring that a reliable seal can be formed between the pole 200 and the cover plate 100 through the sealing ring 600.

[0051] Meanwhile, in this embodiment, H1 is limited to H1≥R1, which ensures that the rounded corners on the pole body 210 are all located inside the groove 610, ensuring that the second segment 620 can fit with the pole body 210, so that the relative position between the two is relatively stable after the sealing ring 600 is fitted onto the pole body 210.

[0052] Figure 6 A partial cross-sectional view of the pole post 200 and the sealing ring 600 in their natural state is shown for the cover plate assembly 1000 of the third structure. Figure 6a A schematic diagram of the sealing ring 600 of the cover plate assembly 1000 with the third structure is shown. Figure 6b A partial cross-sectional view of the sealing ring 600 of the cover plate assembly 1000 with the third structure is shown.

[0053] like Figure 6 , Figure 6a and Figure 6b In some embodiments, when the sealing ring 600 is in the first state, the groove 610 is at an angle.

[0054] The implementation method of avoiding rounded corners through the oblique groove 610 in this embodiment, as well as the technical effect achieved by limiting the size of the groove 610, are similar to the aforementioned solution of avoiding rounded corners through the right-angled groove 610, and will not be repeated here.

[0055] It should be noted that the beveled groove 610 can not only effectively avoid rounded corners, but also, due to the relatively simple structure of the beveled groove 610, help reduce the difficulty of forming the sealing ring 600 and reduce the manufacturing cost of the sealing ring 600.

[0056] like Figure 4In some embodiments, the cover plate assembly 1000 further includes a cover plate 100, the cover plate body 110 including a first surface 112 and a second surface 113 disposed opposite to each other along a first direction; the cover plate 100 includes a cover plate body 110 and a second fixing part 130, the cover plate 100 is provided with a mounting hole 111 extending along the first direction, the second fixing part 130 extends from the second surface 113 at least in the direction of the central axis of the mounting hole 111; the pole post 200 is at least partially disposed in the mounting hole 111, the protrusion 220 is located on the side of the second fixing part 130 near the first surface 112, and the sealing ring 600 is disposed between the protrusion 220 and the second fixing part 130.

[0057] It should be noted that the free end of the second fixing part 130 forms the second end 1112 of the mounting hole 111, and the second end 1112 is the end of the second fixing part 130 that is away from the cover plate body 110.

[0058] It should be noted that the first direction is the thickness direction of the cover plate body 110.

[0059] For example, the second fixing part 130 and the cover plate body 110 can be connected by welding or integral molding.

[0060] like Figure 4 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 can protrude from the second surface 113.

[0061] In addition to the structure described above, the second fixing part 130 can also extend uniformly 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.

[0062] For example, the projection of the protrusion 220 and the second fixing part 130 along the first direction overlaps, so that the pole post 200 cannot pass through the inner hole formed by the second fixing part 130.

[0063] by Figure 4The following explanation uses the direction shown as an example. When assembling the cover plate assembly 1000 of this embodiment, the electrode post 200 fitted with the sealing ring 600 can be inserted into the mounting hole 111. The second fixing part 130 can support and insulate the seal from below, and the sealing ring 600 can be in a first state without compression at this time. After fixing the cover plate 100 and applying a downward force to the electrode post 200, the protrusion 220 and the second fixing part 130 cooperate to compress the sealing ring 600, which can switch the sealing ring 600 to the second state. As can be seen from the foregoing, when the sealing ring 600 is in a compressed and deformed state, it can fit tightly against the surface of the electrode post 200. At the same time, the sealing ring 600 fits tightly against the upper surface of the second fixing part 130, thereby achieving a sealing effect and effectively preventing electrolyte leakage from between the protrusion 220 and the second fixing part 130.

[0064] like Figure 4 In some embodiments, the free end of the second fixing part 130 has a rounded corner at least on the side close to the first surface 112 along the first direction.

[0065] Understandably, when the second fixing part 130 cooperates with the protrusion 220 of the pole post 200 to compress the sealing ring 600, the free end of the second fixing part 130 will also exert a large compressive force on the sealing ring 600. If the part of the free end of the second fixing part 130 that contacts the sealing ring 600 has a protruding sharp edge, it will damage the sealing ring 600 or even cut off the sealing ring 600.

[0066] To avoid the above problems, this embodiment provides a rounded corner on the side of the free end of the second fixing part 130 near the first surface 112 to eliminate the sharp edges of the free end of the second fixing part 130 and protect the sealing ring 600.

[0067] like Figure 4 In some embodiments, the cover plate 100 further includes a first fixing part 120, which extends from the first surface 112 in a first direction away from the cover plate body 110; along the first direction, the protrusion 220 is located between the first fixing part 120 and the second fixing part 130.

[0068] 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 that is away from the cover plate body 110.

[0069] It should be noted that the shape of the outer contour of the cross section of the inner hole formed by the first fixing part 120, the inner hole formed by the second fixing part 130, and the pole body 210 can be circular or polygonal, and is not limited here.

[0070] For example, such as Figure 4The portion of the first fixing part 120 near the cover plate body 110 extends from the first surface 112 in a first direction away from the cover plate body 110, and the portion of the first fixing part 120 near its free end extends in the direction of the central axis of the mounting hole 111.

[0071] Of course, the first fixing part 120 may also extend only from the first surface 112 in the first direction away from the cover plate body 110.

[0072] For example, the first fixing part 120 and the cover plate body 110 can be connected by welding or integral molding. The connection method between the first fixing part 120 and the cover plate body 110 can be the same as or different from the connection method between the second fixing part 130 and the cover plate body 110.

[0073] 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.

[0074] For example, the second side 113 may be connected to the lower insulating member 300.

[0075] For example, the projections of the first fixing part 120 and the pole post 200 along the first direction do not overlap, so that the pole post 200 can pass through the inner hole formed by the first fixing part 120.

[0076] The protrusion 220 and at least a portion of the sealing ring 600 can be located within the space defined by the first fixing portion 120 and the second fixing portion 130, which can limit the position of the pole post 200 and the sealing ring 600 to a certain extent, so that the sealing ring 600 and the second fixing portion 130 can be located in a preset relative position, which helps to prevent the sealing ring 600 and the second fixing portion 130 from shifting. At the same time, the sealing ring 600 is fitted onto the pole post body 210, and the pole post body 210 can also limit the sealing ring 600, preventing relative movement between the sealing ring 600 and the second fixing portion 130, which helps to maintain a good sealing effect of the sealing ring 600.

[0077] like Figure 4 In some embodiments, the cover plate assembly 1000 further includes an insulating portion 400, which is coupled to the sealing ring 600 and located between the cover plate 100 and the pole post 200 to provide an insulated connection between the cover plate 100 and the pole post 200.

[0078] For example, the insulating portion 400 can be formed by injection molding.

[0079] For example, the insulating portion 400 may be located only within the mounting hole 111, or it may extend outward and cover the first fixing portion 120.

[0080] When assembling the cover plate assembly 1000 of this embodiment, after inserting the pole post 200 fitted with the sealing ring 600 into the mounting hole 111 and switching the sealing ring 600 to the first state, the cover plate 100, the sealing ring 600, and the pole post body 210 can be connected by the insulating part 400 to achieve a relatively stable insulating connection between the pole post 200 and the cover plate 100. At this time, the sealing ring 600 remains under pressure deformation to achieve a stable and reliable sealing effect.

[0081] By connecting the cover plate 100 and the pole post 200 through the insulating part 400, the amount of metal material used in the cover plate assembly 1000 as a whole can be reduced, thereby reducing material costs and weight, which is beneficial for mass production.

[0082] Figure 7 The fourth type of cover assembly 1000 was demonstrated. Figure 3 An enlarged diagram of part B in the middle. Figure 8 A partial cross-sectional view of the pole post 200 and the sealing ring 600 in their natural state is shown for the fourth type of cover plate assembly 1000. Figure 9 A schematic diagram of the pole post 200 of the cover plate assembly 1000 of the fourth structure is shown.

[0083] Although the sealing ring 600 can be radially positioned by the pole body 210, the sealing ring 600 fitted on the pole body 210 may slide on the pole body 210 in the first direction, which may have an adverse effect on the assembly of the cover plate assembly 1000 and the sealing reliability of the sealing ring 600.

[0084] To solve the above problems, such as Figure 7 , Figure 8 and Figure 9 In some embodiments, the outer wall of the pole body 210 is provided with an annular positioning groove 240; the second segment 620 is fitted into the positioning groove 240.

[0085] For example, along the first direction, the positioning groove 240 is located on the side of the corner 230 away from the protrusion 220.

[0086] For example, the pole body 210 is a cylindrical structure.

[0087] by Figure 8 The structure and orientation shown are used as an example for explanation. When the second segment 620 of the sealing ring 600 is fitted into the positioning groove 240, the inner surface of the positioning groove 240 along the first direction (i.e., the transverse upper and lower planes) can limit the second segment 620 to restrict the relative movement between the sealing ring 600 and the pole body 210 along the first direction, and prevent the sealing ring 600 from shifting or deviating along the first direction.

[0088] In accordance with the foregoing, after the pole post 200, equipped with the sealing ring 600, is inserted into the mounting hole 111, the pole post 200 needs to be pressed downwards. At this time, if the sealing ring 600 is not restrained, it will move towards the protrusion 220 and interfere with the corner 230, adversely affecting its sealing performance. This embodiment, by providing the positioning groove 240, prevents the sealing ring 600 from moving towards the protrusion 220 and from interfering with the corner 230, thus improving the sealing reliability of the sealing ring 600.

[0089] It should be noted that the position of the positioning groove 240 on the pole body 210 can be designed according to the dimensions of the sealing ring 600 along the first direction. When the second segment 620 is fitted into the positioning groove 240, the first segment 230 of the sealing ring 600 can fit against the bottom surface of the protrusion 220.

[0090] Figure 10 A partial cross-sectional view of the pole post 200 of the cover plate assembly 1000 of the fourth structure is shown.

[0091] like Figure 10 In some embodiments, the pole body 210 includes a bottom portion 211 located along a first direction on the side of the positioning groove 240 away from the protrusion 220; the projection of the bottom portion 211 along the first direction covers the projection of the bottom of the positioning groove 240 along the first direction.

[0092] It should be noted that the bottom of the positioning groove 240 is a cylindrical surface.

[0093] Taking the pole body 210 as a cylindrical structure as an example, the diameter of the bottom part 211 is D1, and the diameter of the pole body 210 located at the positioning groove 240 is D2, where D2≤D1.

[0094] For example, taking the pole body 210 as a cylindrical structure, along the first direction, the diameter of the part of the pole body 210 located on the side of the positioning groove 240 near the protrusion 220 is D3, where D1≤D3.

[0095] Combination Figure 8 and Figure 10 The pole body 210 is provided with a positioning groove 240. Along the first direction, when D1 is greater than D2, the bottom part 211 can limit the second section 620 to prevent the sealing ring 600 from moving downward along the first direction and to avoid the sealing ring 600 from slipping off the pole body 210.

[0096] Figure 11 A partial cross-sectional view of the sealing ring 600 of the cover plate assembly 1000 of the fourth structure is shown.

[0097] like Figure 7 and Figure 8In some embodiments, the second segment 620 is fitted to the bottom of the positioning groove 240.

[0098] like Figure 10 and Figure 11 Taking the cylindrical structure of the pole body 210 as an example, the inner diameter of the second segment 620 is D4. To ensure that the second segment 620 fits snugly against the bottom of the positioning groove 240, D4 ≤ D2. It should be noted that, as mentioned above, the sealing ring 600 is a deformable elastic structural component. Even if D4 is small, when fitting the sealing ring 600 onto the pole body 210, the inner diameter of the sealing ring 600 can be expanded by external force to ensure that the second segment 620 fits snugly against the bottom of the positioning groove 240.

[0099] If the second segment 620 and the bottom of the positioning groove 240 are spaced apart, the sealing ring 600 can move relative to the pole body 210 along the second direction, which is not conducive to the positioning of the sealing ring 600.

[0100] To avoid the above problems, this embodiment makes the second segment 620 fit with the bottom of the positioning groove 240. This not only ensures that the sealing ring 600 is limited in the first direction by the positioning groove 240, but also ensures that the sealing ring 600 is limited in the second direction by the bottom of the positioning groove 240, preventing the sealing ring 600 from shifting.

[0101] like Figure 10 and Figure 11 In some embodiments, along the first direction, the size of the positioning groove 240 is H3, and the size of the second segment 620 is H4, where H4≤H3.

[0102] If H4 > H3, the second segment 620 will be difficult to reliably fit into the positioning groove 240, which will not only cause inconvenience to the assembly of the cover plate assembly 1000, but also make it difficult to effectively position the sealing ring 600 through the positioning groove 240.

[0103] To solve the above problems, this embodiment limits H4 to H4≤H3 to ensure that the second segment 620 can be smoothly fitted into the positioning groove 240, thereby limiting the sealing ring 600 through the positioning groove 240 and preventing the sealing ring 600 from shifting.

[0104] In addition to positioning the sealing ring 600 by setting a positioning groove 240 on the pole body 210 as described above, the positioning between the sealing ring 600 and the pole body 210 can also be achieved by other means.

[0105] like Figure 4 In some embodiments, the sealing ring 600 is adhesively bonded to the outer wall of the pole body 210.

[0106] For example, in this embodiment, the positioning groove 240 that cooperates with the sealing ring 600 may not be provided on the pole body 210.

[0107] For example, in this embodiment, the inner diameter of the sealing ring 600 is approximately the same as the diameter of the pole body 210, or the inner diameter of the sealing ring 600 is smaller than the diameter of the pole body 210.

[0108] Before assembling the sealing ring 600 with the pole post 200, adhesive can be applied to the outer wall of the pole post body 210 and / or the inner wall of the second section 620. After the sealing ring 600 is fitted onto the pole post body 210, the adhesive can be used to form a reliable connection between the sealing ring 600 and the pole post body 210 to prevent the sealing ring 600 from shifting or deviating.

[0109] like Figure 4 In some embodiments, the sealing ring 600 is interference-fitted with the pole body 210, and the interference amount is ≥0.05mm.

[0110] For example, the interference fit is less than 0.2 mm. If the interference fit is too large, it will cause inconvenience to the assembly of the sealing ring 600 and the pole body 210. Therefore, the interference fit can be limited to less than 0.2 mm, which can reduce the assembly difficulty of the sealing ring 600 and the pole body 210 and ensure the assembly efficiency of the cover plate assembly 1000.

[0111] When the sealing ring 600 is interference-fitted with the pole body 210, a large frictional force can be generated between the second section 620 and the outer wall of the pole body 210. This frictional force can prevent the sealing ring 600 from moving relative to the pole body 210, thus preventing the sealing ring 600 from shifting.

[0112] However, if the interference is too small, the aforementioned frictional force is insufficient to restrict the relative movement between the sealing ring 600 and the pole body 210.

[0113] To avoid the above problems, this embodiment designs the interference fit to be ≥0.05mm, which can effectively prevent the sealing ring 600 from moving relative to the pole body 210.

[0114] like Figure 4 and Figure 5 In some embodiments, the sealing ring 600 includes a second segment 620 surrounding the pole body 210, the inner wall of the second segment 620 being fitted with the outer wall of the pole body 210, and at least one of the inner wall of the second segment 620 and the outer wall of the pole body 210 having a textured structure.

[0115] For example, the embossed structure may include knurling.

[0116] The following explanation uses the example of forming an uneven structure on the inner wall of the second segment 620. The uneven structure can make the surface roughness of the inner wall of the second segment 620 larger. When the inner wall of the second segment 620 is in contact with the outer wall of the pole body 210, a large frictional force can be generated between the two. This frictional force can prevent the sealing ring 600 from moving relative to the pole body 210, thereby preventing the sealing ring 600 from shifting.

[0117] Based on the same inventive concept and in conjunction with the description of the cover plate assembly 1000 in the above embodiments, this embodiment provides a single battery cell that has the corresponding technical effects of the cover plate assembly 1000 in the above embodiments, which will not be repeated here.

[0118] Figure 12 A schematic diagram of a single battery cell is shown.

[0119] like Figure 12 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.

[0120] 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.

[0121] It should be noted that some embodiments of this application have been described above. Other embodiments are within the scope of the appended claims.

[0122] 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.

[0123] 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.

[0124] 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.

[0125] 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.

[0126] 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 (1000) characterized by, include: An electrode post includes an electrode post body and a protrusion disposed circumferentially along the outer wall of the electrode post body, wherein an angle is formed between the electrode post body and the protrusion. A sealing ring is fitted onto the pole body and extends at least to the corner. The sealing ring has a groove along its circumference, and the groove is opposite to the corner. When the sealing ring is in the first state, the groove is spaced apart from the corner; when the sealing ring is in the second state, the groove is fitted with the corner.

2. The cover plate assembly of claim 1, wherein, The sealing ring includes a first segment and a second segment connected to each other. The first segment fits into the protrusion, and the second segment fits into the pole body. The groove is disposed between the first segment and the second segment.

3. The cover plate assembly of claim 1, wherein, The corners are rounded.

4. The cover plate assembly of claim 3, wherein, When the sealing ring is in the first state, the groove is a right angle or an oblique angle; The radius of the rounded corner is R1, the dimension of the groove along the first direction is H1, and the dimension along the second direction is L1, H1≥R1, and L1≥R1; the central axis of the pole extends along the first direction, and the second direction is perpendicular to the first direction.

5. The cover plate assembly of claim 1, wherein, The cover plate assembly further includes a cover plate, the cover plate body including a first surface and a second surface disposed opposite to each other along a first direction; the central axis of the pole extends along the first direction. The cover plate includes a cover plate body and a second fixing part. The cover plate is provided with a mounting hole that extends through the first direction. The second fixing part extends from the second surface at least in the direction of the central axis of the mounting hole. The pole post is at least partially inserted through the mounting hole; the protrusion is located on the side of the second fixing part closer to the first surface, and the sealing ring is disposed between the protrusion and the second fixing part.

6. The cover plate assembly of claim 5, wherein, The free end of the second fixing part has a rounded corner at least on the side closest to the first surface along the first direction; or, The cover plate further includes a first fixing portion, which extends from the first surface in a direction away from the cover plate body along the first direction; along the first direction, the protrusion is located between the first fixing portion and the second fixing portion; or... The cover plate assembly further includes an insulating portion that engages with the sealing ring and is located between the cover plate and the pole post, so that the cover plate and the pole post are insulated from each other.

7. The cover plate assembly of claim 2, wherein, The outer wall of the pole body is provided with an annular positioning groove; the second section is fitted into the positioning groove.

8. The cover plate assembly of claim 7, wherein, The pole post body includes a bottom portion located along a first direction on the side of the positioning groove away from the protrusion; the central axis of the pole post extends along the first direction; the projection of the bottom portion along the first direction covers the projection of the bottom of the positioning groove along the first direction; or... The second segment fits into the bottom of the positioning groove; or, Along the first direction, the size of the positioning groove is H3, the size of the second segment is H4, and H4 ≤ H3; the central axis of the pole extends along the first direction.

9. The cover plate assembly according to claim 1, characterized in that, The sealing ring is adhesively bonded to the outer wall of the pole body; or... The sealing ring is interference-fitted with the pole body, and the interference amount is ≥0.05mm; or, The sealing ring includes a second section surrounding the pole body; the inner wall of the second section fits against the outer wall of the pole body, and at least one of the inner wall of the second section and the outer wall of the pole body has a concave-convex structure.

10. A single cell, characterized by 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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