Cover plate assembly and battery

Abstract

The invention provides a cover plate assembly and a battery. The cover plate assembly comprises a cover plate body, a pole and a sealing ring. The cover plate body is provided with a first through hole. The pole comprises a bottom plate part, a supporting part and an extending part which are sequentially arranged in the first direction. In the second direction, the supporting part protrudes out of the extending part, the bottom plate part protrudes out of the supporting part, and the extending part penetrates through the first through hole. The sealing ring is supported on the face, away from the bottom plate part, of the supporting part, and the sealing ring is arranged outside the extending part in a sleeving mode and at least abuts against the position between the side wall of the first through hole and the extending part. According to the cover plate assembly, the structure of the pole is adjusted to obtain the pole with the supporting part, so that the overall weight and cost of the pole are reduced, the effective supporting requirement of the sealing ring is met, the weight and cost of the pole and the cover plate assembly are reduced, and the lightweight application requirement is met. The battery is provided with the cover plate assembly, so that the overall weight and the cost are reduced, and the battery is suitable for the field of lightweight application.

Description

Technical Field

[0001] The present application belongs to the field of battery technology and relates to a cover assembly and a battery. Background Art

[0002] A battery cover typically consists of a cover body, a terminal extending through the body, and an insulating seal. The terminal facilitates current transfer between the battery and the outside, while the seal ensures a tight seal between the terminal and other components of the battery cover (e.g., the cover body). The terminal, seal, and other components must fit tightly together to ensure the reliability of the battery cover.

[0003] Given this, the terminal's structural design not only considers its own strength and conductivity, but also requires adaptive adjustments based on the structures of other components to meet the requirements of precise assembly. Therefore, compared to its theoretical structure, the terminal is often designed to be heavier, which increases the overall weight and cost of the battery, hindering the lightweight and cost-effectiveness requirements of the battery system. Summary of the Invention

[0004] In view of the above-mentioned shortcomings of the prior art, the purpose of the present application is to provide a cover plate assembly and a battery, which are used to improve the problem in the prior art that the pole weight is too heavy and is not conducive to achieving lightweight batteries.

[0005] To achieve the above objectives and other related objectives, in a first aspect, the present application provides a cover plate assembly, comprising:

[0006] The cover body is provided with a first through hole;

[0007] The pole comprises a bottom plate portion, a supporting portion, and an extending portion sequentially arranged along a first direction, wherein in a second direction, the supporting portion protrudes outside the extending portion, and the bottom plate portion protrudes outside the supporting portion, and the extending portion passes through the first through hole;

[0008] The sealing ring is supported on a side of the supporting portion away from the bottom plate portion, and is sleeved outside the extending portion and at least abuts between the side wall of the first through hole and the extending portion.

[0009] In an optional embodiment, in the first direction, the thickness of the bottom plate portion is H1, the thickness of the support portion is H2, and H1≤H2.

[0010] In an optional embodiment, the sealing ring includes a main sealing portion, and the main sealing portion abuts between the extension portion and the side wall of the first through hole; wherein,

[0011] In the second direction, the effective sealing length of the main sealing portion in the assembled state is L, and L is ≥ 0.7 mm.

[0012] In an optional embodiment, the cover assembly further includes a first insulating member, and in the first direction, the first insulating member is located on the first side of the cover body; wherein,

[0013] The first insulating member is provided with a first groove, a second groove, and a second through hole that are sequentially connected along the first direction, and the extension portion passes through the first groove, the second groove, and the second through hole in sequence to penetrate the first insulating member;

[0014] The bottom plate portion is embedded in the second groove, and a side of the bottom plate portion away from the cover plate body protrudes out of the second groove in a direction away from the cover plate body.

[0015] In an optional embodiment, the first insulating member is further provided with at least one rib, the rib is located in the second groove, and a surface of the bottom plate portion close to the cover plate body abuts against the rib.

[0016] In an optional embodiment, the cover assembly further includes a second insulating member, wherein in the first direction, the second insulating member is located on a second side of the cover body, the second side being arranged opposite to the first side, and the second insulating member is provided with a third through hole, and the extension portion passes through the third through hole;

[0017] The sealing ring includes a first sealing portion, the first sealing portion abutting between the side wall of the third through hole and the extension portion; wherein,

[0018] In the second direction, the thickness of the first sealing portion in an unassembled state is T1, and 0.3 mm≤T1≤3 mm.

[0019] In an optional embodiment, in the second direction, the width of the support portion protruding from the extension portion is W;

[0020] The sealing ring further includes a second sealing portion, the second sealing portion is communicated with the first sealing portion, and the second sealing portion is located between the first sealing portion and the supporting portion;

[0021] In the second direction, the thickness of the second sealing portion in an unassembled state is T2, T2>T1 and 0.1≤T2 / W≤1.

[0022] In an optional embodiment, the sealing ring further includes a third sealing portion, the third sealing portion abutting between the extension portion and the side wall of the second through hole, and the third sealing portion communicating with the second sealing portion;

[0023] In the second direction, the thickness of the third sealing portion in an unassembled state is T3, T3>T2 and 0.1<T3 / W≤1.1.

[0024] In an optional embodiment, in the second direction: the cross-section of the supporting portion is rectangular, circular or waist-shaped; and / or the cross-section of the extending portion is circular or waist-shaped.

[0025] In a second aspect, the present application provides a battery comprising the cover assembly as described in the first aspect.

[0026] As described above, the cover plate assembly of the present application reduces the overall weight and cost of the pole by adjusting the structure of the pole to obtain a pole with a support portion. The provision of the support portion can meet the effective support requirements of the sealing ring, thereby ensuring that the overall sealing performance of the cover plate assembly will not be lost due to the adjustment of the pole structure. This reduces the weight and cost of the pole and cover plate assembly, meeting the requirements of lightweight applications. The battery of the present application, because it is equipped with the cover plate assembly, has a reduced overall weight and cost, making it suitable for lightweight applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a cross-sectional schematic diagram of a cover plate assembly in the related art.

[0028] Figure 2 It is a three-dimensional schematic diagram of a pole in a cover assembly in the related art.

[0029] Figure 3 for Figure 2 A partial enlarged schematic diagram of the dotted box P1 in the middle.

[0030] Figure 4 A schematic diagram of the three-dimensional structure of a cover assembly provided in an embodiment of the present application.

[0031] Figure 5 for Figure 4 Schematic diagram of the exploded structure of the cover assembly shown in .

[0032] Figure 6 for Figure 4 A schematic top view of the cover plate assembly is shown in FIG.

[0033] Figure 7 For the Figure 6 Schematic cross-sectional view at A-A'.

[0034] Figure 8 For the Figure 6 Schematic cross-sectional view at BB'.

[0035] Figure 9 for Figure 7 A partial enlarged schematic diagram of the dotted box P5.

[0036] Figure 10 A schematic cross-sectional view of the first insulating member in the cover assembly provided in an embodiment of the present application.

[0037] Figure 11 This is a schematic top view of the first type of pole provided in an embodiment of the present application.

[0038] Figure 12 This is a three-dimensional schematic diagram of the second type of pole provided in an embodiment of the present application.

[0039] Figure 13 for Figure 12 Schematic top view of the pole shown.

[0040] Figure 14 For the Figure 11 Schematic diagram of the cross section at C-C'.

[0041] Figure 15 This is a schematic top view of the third type of pole provided in an embodiment of the present application.

[0042] Figure 16 This is a schematic top view of the fourth type of pole provided in an embodiment of the present application.

[0043] Figure 17 For the Figure 15 Schematic diagram of the cross section at D-D'.

[0044] Figure 18 This is a schematic structural diagram of the first sealing ring provided in an embodiment of the present application.

[0045] Figure 19 For the Figure 18 Schematic cross-sectional view at E-E'.

[0046] Figure 20 This is a schematic structural diagram of the second sealing ring provided in an embodiment of the present application.

[0047] Figure 21 For the Figure 19 Schematic cross-sectional view at F-F'.

[0048] Figure 22 for Figure 9 The cross-sectional view of the sealing ring before and after assembly is shown in the dashed line width P7.

[0049] Description of reference numerals:

[0050] 10a - cover body, 20a - pole, 21a - bottom plate, 23a - extension, 30a - sealing ring, 40a - first insulating member, 50a - second insulating member, 60a - rivet block;

[0051] 10-cover plate body, 11-first through hole; 20-pole, 21-bottom plate, 22-support portion, 23-extension portion; 30-sealing ring, 31-first sealing portion, 32-second sealing portion, 33-third sealing portion; 40-first insulating member, 41-first groove, 42-second groove, 43-second through hole, 44-rib; 50-second insulating member, 51-third through hole; 60-rivet block. DETAILED DESCRIPTION

[0052] The following describes the embodiments of the present application through specific examples. Those skilled in the art will readily understand the other advantages and benefits of the present application from the disclosure herein. The present application may also be implemented or applied through various other specific embodiments, and the details in this specification may be modified or altered based on different viewpoints and applications without departing from the spirit of the present application.

[0053] See also Figures 1 to 22 It should be noted that the diagrams provided in this embodiment are only for schematically illustrating the basic concept of the present application. Therefore, the diagrams only show components related to the present application and are not drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed at will, and the component layout may also be more complex.

[0054] See also Figure 1 and Figure 2 ,in, Figure 1 shows a cross-sectional schematic diagram of a cover plate assembly in the related art, Figure 2 FIG. 1 shows a three-dimensional schematic diagram of the pole in the cover assembly. Figure 1 As shown in FIG. 1 , the cover assembly includes a cover body 10a, a pole 20a, a sealing ring 30a, a first insulating member 40a, a second insulating member 50a, and a rivet block 60a. The pole 20a sequentially passes through the first insulating member 40a, the cover body 10a, and the second insulating member 50a, and is embedded in the rivet block 60a and riveted to the rivet block 60a. The sealing ring 30a is sleeved on the outside of the pole 20a to abut against the first insulating member 40a, the cover body 10a, and the second insulating member 50a. The pole 20a in the cover assembly is shown in FIG. Figure 2 The assembly comprises a bottom plate portion 21a and an extension portion 23a located on the bottom plate portion 21a. In the assembled state, the bottom plate portion 21a is embedded in a limiting groove (such as the second groove described below) in the first insulating member 40a, and the extension portion 23a passes through the first insulating member 40a and other structural members.

[0055] See also Figure 3 , Figure 3 Shown Figure 2 The partially enlarged schematic diagram of the dotted box P1 in the figure. Figure 3As shown in the dotted box P2, in order to ensure the hot melt sealing effect of the first insulating member 40a, the height of the limit groove needs to be greater than 2.5mm. In order to meet the subsequent welding connection requirements between the cover assembly and the tab, the side of the bottom plate portion 21a away from the cover body 10a needs to protrude from the side where the limit groove is away from the cover body 10a. On the other hand, Figure 3 As shown in the dotted box P3, the bottom plate portion 21a needs to provide sufficient support area for the sealing ring 30a to ensure the sealing performance of the sealing ring 30a on the cover assembly. Figure 3 As shown in the dashed box P4, in related art, the bottom plate portion 21a is relatively thick, which affects the overall weight of the terminal 20a and is not conducive to achieving lightweight terminal 20a. If the bottom plate portion 21a is thinned as a whole, either the convenience and reliability of the tab welding will be affected, or the support of the sealing ring 30a will be insufficient, affecting the sealing performance of the cover plate assembly and even the overall battery, which does not meet practical application requirements.

[0056] In view of this, an embodiment of the present application provides a cover plate assembly in which a pole post comprises a bottom plate portion, a support portion, and an extension portion. The support portion effectively supports the sealing ring while reducing the overall weight of the pole post, thus meeting the need for pole lightweighting. For details, please refer to the following.

[0057] The present application embodiment provides a cover plate assembly, see Figure 4 and Figure 5 ,in, Figure 4 shows a schematic diagram of the three-dimensional structure of the cover assembly, Figure 5 The exploded structural diagram of the cover plate assembly is shown. The cover plate assembly includes a cover plate body 10, a pole 20, and a sealing ring 30. To facilitate the description of the structure introduced in the embodiments of the present application, herein, the axial direction of the pole 20 (or the thickness direction of the cover plate body 10) is taken as the first direction Z, and the extension direction of the plane perpendicular to the first direction Z (i.e., the XY plane) is taken as the second direction. For example, the second direction includes the radial direction when the cross section of the pole 20 perpendicular to the first direction Z is circular or quasi-circular, and also includes the length direction or width direction when the cross section of the pole 20 perpendicular to the first direction Z is rectangular.

[0058] Specifically, the cover body 10 is provided with a first through hole 11. The pole 20 includes a bottom plate portion 21, a support portion 22, and an extension portion 23 arranged in sequence along the first direction Z. In the second direction, the support portion 22 protrudes outside the extension portion 23, and the bottom plate portion 21 protrudes outside the support portion 22. The extension portion 23 passes through the first through hole 11. The second direction is perpendicular to the first direction Z. Figure 6 and Figure 7 ,in, Figure 6 1 shows a schematic top view of the cover plate assembly, Figure 7Shown along Figure 6 The sealing ring 30 is supported on the side of the support portion 22 away from the bottom plate portion 21, and the sealing ring 30 is sleeved outside the extension portion 23 and at least abuts between the side wall of the first through hole 11 and the extension portion 23. The specific structure of the pole 20 is equivalent to that in the second direction, the orthographic projection of the extension portion 23 completely falls on the side of the support portion 22 away from the bottom plate portion 21, and the orthographic projection of the support portion 22 completely falls on the side of the bottom plate portion 21 close to the support portion 22, wherein "completely falling" includes the situation where the edges overlap. Please refer to Figure 8 , Figure 8 Shown along Figure 6 Schematic cross-sectional view at BB'.

[0059] Please refer to 3 and Figure 9 ,in, Figure 9 Shown Figure 7 The partial enlarged schematic diagram of the dotted line frame P5. In the embodiment of the present application, the structure of the pole 20 is adjusted to obtain the pole 20 with the support portion 22. Figure 3 The dotted box P4 and Figure 9 As can be seen from the structure shown in the dotted box P5, the arrangement of the support portion 22 provides a locally thinned pole 20, thereby reducing the overall weight and cost of the pole 20. Figure 3 The dotted box P3 and Figure 9 As shown in the structure shown in the dashed box P6, the provision of the support portion 22 can effectively support the sealing ring 30, thereby ensuring that the overall sealing performance of the cover plate assembly is not compromised due to the structural adjustment of the pole 20. Therefore, the pole 20 of the present embodiment can reduce the weight and cost of the pole 20 and the cover plate assembly while maintaining the original performance of the cover plate assembly (especially the sealing performance), making it suitable for lightweight applications.

[0060] In some embodiments, as Figure 5 、 Figure 7 and Figure 9 As shown, the cover assembly further includes a first insulating member 40. In the first direction Z, the first insulating member 40 is located on the first side of the cover body 10. Figure 10 , Figure 10The figure shows a cross-sectional schematic diagram of the first insulating member 40. The first insulating member 40 is provided with a first groove 41, a second groove 42, and a second through-hole 43 that are sequentially connected along the first direction Z. The first groove 41 opens from the side of the first insulating member 40 away from the cover body 10, and the second groove 42 opens from the bottom wall of the first groove 41. The extension portion 23 passes through the first groove 41, the second groove 42, and the second through-hole 43 in sequence to penetrate the first insulating member 40. The bottom plate portion 21 is embedded in the second groove 42, and the side of the bottom plate portion 21 away from the cover body 10 protrudes outside the second groove 42 in the direction away from the cover body 10, as shown in FIG. Figure 9 As shown in the dashed box P7, in one embodiment, the first insulating member 40 is made of lower plastic. The sealing ring 30 also abuts between the second through-hole 43 and the extension 23 to achieve a sealing effect between the terminal 20 and the first insulating member 40. The first insulating member 40 is provided to provide insulation between the bottom plate 21 and the cover body 10.

[0061] In some embodiments, as Figure 9 As shown in FIG10 , the first insulating member 40 further has at least one rib 44 , which is located in the second groove 42 (the rib 44 is disposed on the bottom wall of the second groove 42 ), and a surface of the bottom plate portion 21 close to the cover body 10 abuts against the rib 44 .

[0062] In the embodiment of the present application, in order to reduce the weight of the pole 20, the pole 20 is constructed with a support portion 22. During the assembly process of the pole 20 and the first insulating member 40, the pole 20 may wobble and move when embedded in the groove, which may affect assembly efficiency and yield. The provision of the rib 44 on the first insulating member 40 not only increases the mechanical strength and insulation performance of the first insulating member 40 corresponding to the weak thickness of the portion accommodating the pole 20, but also provides a certain limit to the bottom plate portion 21 by abutting against the bottom plate portion 21, thereby facilitating improved assembly efficiency and yield. The material of the rib 44 can be consistent with that of the first insulating member 40. While being integrally formed or forming a one-piece structure with the first insulating member 40, the rib 44 has a lower density than the material of the pole 20 and does not significantly increase the overall weight of the cover assembly, thereby maintaining the lightweight advantage of the pole 20.

[0063] Next, see Figures 11 to 21 , the specific structure of the pole 20 and the sealing ring 30 in the embodiment of the present application is illustrated.

[0064] Figure 11 shows a schematic top view of the first type of pole, Figure 12 shows a three-dimensional schematic diagram of the second type of pole, Figure 13 Shown Figure 12The top view of the pole shown is Figure 14 Shown along Figure 11 (and Figure 13 ) is a schematic cross-sectional view at C-C', Figure 15 1 shows a top view of the third type of pole, Figure 16 1 shows a schematic top view of the fourth type of pole, Figure 17 Shown along Figure 15 (and Figure 16 ) is a schematic cross-sectional view at D-D'.

[0065] In some embodiments, in the second direction, the cross section of the support portion 22 is rectangular (eg Figure 12 、 Figure 13 and Figure 16 As shown), round (as Figure 11 as shown) or waist-shaped (as Figure 15 As shown). Further, in the case where the cross section of the support portion 22 is rectangular, the support portion 22 can be a rounded rectangle or a chamfered rectangle. Wherein, when the cross section of the support portion 22 is rectangular, the width of the support portion 22 is less than or equal to the width of the bottom plate portion 21, the length of the support portion 22 is less than or equal to the length of the bottom plate portion 21, and the width of the support portion 22 is less than or equal to the length of the support portion 22 (for example, the X direction is the length direction, and the Y direction is the width direction). Further, the cross section of the extension portion 23 is circular (as shown). Figure 4 、 Figures 11 to 13 as shown) or waist-shaped (as Figure 15 and Figure 16 shown).

[0066] In some embodiments, see Figures 18 to 21 The cross section of the sealing ring 30 is annular (eg Figures 18 to 21 The sealing ring 30 may be shaped like a ring (as shown) or a racetrack (not shown). Since the sealing ring 30 is positioned over the extension 23, the cross-sectional shape of the sealing ring 30 preferably matches that of the extension 23 to ensure sealing performance. For example, if the extension 23 has a circular cross-section, the sealing ring 30 may have a circular cross-sectional shape. Alternatively, if the extension 23 has a waist-shaped cross-section, the sealing ring 30 may have a racetrack cross-sectional shape.

[0067] In some embodiments, the cover assembly further includes a second insulating member 50. In the first direction Z, the second insulating member 50 is located on a second side of the cover body 10, the second side being opposite the first side. The second insulating member 50 defines a third through-hole 51, through which the extension 23 passes. In one specific example, the second insulating member 50 is a plastic upper member.

[0068] Furthermore, the sealing ring 30 includes a first sealing portion 31, which abuts between the side wall of the third through hole 51 and the extension portion 23. In the second direction, the thickness of the first sealing portion 31 in the unassembled state is T1, 0.3mm≤T1≤3mm. For example, T1 is 0.3mm, 0.7mm, 1mm, 1.5mm, 2mm, 2.5mm or 3mm. If T1 is too small (for example, less than 3mm), when the second insulating member 50 is assembled with the cover body 10 equipped with the pole 20, the first insulating member 40 and the sealing ring 30, the second insulating member 50 is likely to crush the first sealing portion 31, thereby causing damage to the sealing between the pole 20 and the second insulating member 50 or even the cover body 10, and subsequent air leakage.

[0069] In some embodiments, in the second direction, the width of the support portion 22 protruding beyond the extension portion 23 is W. The sealing ring 30 also includes a second sealing portion 32, which is in communication with the first sealing portion 31 and located between the first sealing portion 31 and the support portion 22. In the second direction, the thickness of the second sealing portion 32 in the unassembled state is T2, where T2>T1 and 0.1≤T2 / W≤1. For example, T2 / W can be 1, 0.9, 0.8, 0.6, 0.3, or 0.1. In this case, the sealing ring 30 has a two-stage structure, with the portion of the first sealing portion 31 used to seal the cover body 10 serving as the primary sealing portion. In this case, the first sealing portion 31 abuts not only between the second through hole 43 and the extension portion 23, but also between the first through hole 11 and the extension portion 23. If T2 / W is too large (e.g., greater than 1), the sealing ring 30 can be easily damaged, thereby affecting its overall lifespan and sealing effectiveness.

[0070] In some embodiments, the sealing ring 30 further includes a third sealing portion 33, which abuts between the extension portion 23 and the side wall of the second through hole 43. The third sealing portion 33 is connected to the second sealing portion 32. In the second direction, the thickness of the third sealing portion 33 in the unassembled state is T3, T3>T2 and 0.1<T3 / W≤1.1. For example, T3 / W can be 1.1, 1, 0.8, 0.5, 0.3 or 0.15. In this case, the sealing ring 30 has a three-section structure, in which the second sealing portion 32 is the main sealing portion. If T3 / W is too large (for example, greater than 1.1), the sealing ring 30 is easily crushed, thereby affecting the overall life and sealing effect of the sealing ring 30.

[0071] It should be noted that since the cross-sectional shape of the sealing ring 30 may be a circular ring, a waist hole shape or other suitable shapes, the above-mentioned thickness of each sealing part (for example, the first sealing part 31, the second sealing part 32 and the third sealing part 33) refers to the minimum distance value between the inner wall and the outer wall of the corresponding sealing part.

[0072] In some embodiments, as Figure 17 As shown, in the first direction Z, the thickness of the bottom plate portion 21 is H1, and the thickness of the support portion 22 is H2, where H1 ≤ H2. In the embodiment of the present application, the support portion 22 is used to support the sealing ring 30. The thickness of the support portion 22 is relatively thick relative to the thickness of the bottom plate portion 21 to prevent the sealing ring 30 from being burned when welding the tab to the bottom plate portion 21 during the subsequent assembly process.

[0073] In some embodiments, the sealing ring 30 includes a main sealing portion that abuts between the extension portion 23 and the side wall of the first through hole 11. The main sealing portion varies depending on the specific structure of the sealing ring 30 (see above). In the second direction, the effective sealing length of the main sealing portion in the assembled state is L, where L is ≥ 0.7 mm. Figure 22 , Figure 22 Shown Figure 9 The cross-sectional view of the sealing ring 30 in the dotted frame P6 before and after assembly, wherein: Figure 22 The dashed line represents the partial outline of the sealing ring 30 in its unassembled state. Because the seal is squeezed by other structural components in the assembled state compared to the unassembled state, the width of the same portion of the sealing ring 30 is reduced in the assembled state compared to the unassembled state. Therefore, the "effective sealing length" refers to the length of the main sealing portion of the sealing ring 30 that effectively seals the cover body 10 in the assembled state (i.e., the length of the main sealing portion compressed in the assembled state). If L is too small (e.g., less than 0.7 mm), a good seal against the cover body 10 cannot be achieved, rendering the cover assembly unsuitable for practical use.

[0074] In some embodiments, as Figures 4 to 9 As shown, the cover assembly also includes a rivet block 60, which is embedded in the second insulating member 50. The extension portion 23 also extends into the rivet block 60 and is riveted to the rivet block 60. The rivet block 60 is used to ensure the overall structural stability and reliability of the cover assembly. The second insulating member 50 is sandwiched between the cover body 10 and the rivet block 60 to provide insulation between the rivet block 60 (and the terminal 20) and the cover body 10.

[0075] The cover assembly of the embodiment of the present application reduces the overall weight and cost while maintaining the overall working performance, thus meeting the requirements of lightweight applications.

[0076] An embodiment of the present application also provides a battery, comprising the cover plate assembly as described above.

[0077] The battery of the embodiment of the present application is equipped with the above-mentioned cover plate assembly, so the overall weight and cost are reduced, and it is suitable for lightweight application scenarios.

[0078] The above embodiments are merely illustrative of the principles and effects of this application and are not intended to limit this application. Anyone skilled in the art may modify or alter the above embodiments without departing from the spirit and scope of this application. Therefore, all equivalent modifications or alterations made by one of ordinary skill in the art without departing from the spirit and technical concepts disclosed in this application shall be covered by the claims of this application.

Claims

1. A cover plate assembly, characterized in that: include: The cover body is provided with a first through hole; The pole comprises a bottom plate portion, a supporting portion, and an extending portion sequentially arranged along a first direction, wherein in a second direction, the supporting portion protrudes outside the extending portion, and the bottom plate portion protrudes outside the supporting portion, and the extending portion passes through the first through hole; The sealing ring is supported on a side of the supporting portion away from the bottom plate portion, and is sleeved outside the extending portion and at least abuts between the side wall of the first through hole and the extending portion.

2. The cover plate assembly according to claim 1, wherein: In the first direction, the thickness of the bottom plate portion is H1, the thickness of the support portion is H2, and H1≤H2.

3. The cover plate assembly according to claim 1, wherein: The sealing ring includes a main sealing portion, and the main sealing portion abuts between the extension portion and the side wall of the first through hole; wherein, In the second direction, the effective sealing length of the main sealing portion in the assembled state is L, and L is ≥ 0.7 mm.

4. The cover plate assembly according to claim 1, wherein: The cover assembly further includes a first insulating member, wherein in the first direction, the first insulating member is located on a first side of the cover body; The first insulating member is provided with a first groove, a second groove and a second through hole which are sequentially connected along the first direction, and the extension portion passes through the first groove, the second groove and the second through hole in sequence to penetrate the first insulating member; The bottom plate portion is embedded in the second groove, and a side of the bottom plate portion away from the cover plate body protrudes out of the second groove in a direction away from the cover plate body.

5. The cover plate assembly according to claim 4, wherein: The first insulating member is further provided with at least one rib portion, the rib portion is located in the second groove, and a surface of the bottom plate portion close to the cover plate body abuts against the rib portion.

6. The cover plate assembly according to claim 4, wherein: The cover assembly further includes a second insulating member, wherein in the first direction, the second insulating member is located on a second side of the cover body, the second side being opposite to the first side, and the second insulating member is provided with a third through hole, and the extension portion passes through the third through hole; The sealing ring includes a first sealing portion, the first sealing portion abutting between the side wall of the third through hole and the extension portion; wherein, In the second direction, the thickness of the first sealing portion in an unassembled state is T1, and 0.3 mm≤T1≤3 mm.

7. The cover plate assembly according to claim 6, wherein: In the second direction, the width of the support portion protruding from the extension portion is W; The sealing ring further includes a second sealing portion, the second sealing portion is communicated with the first sealing portion, and the second sealing portion is located between the first sealing portion and the supporting portion; In the second direction, the thickness of the second sealing portion in an unassembled state is T2, T2>T1 and 0.1≤T2 / W≤1.

8. The cover plate assembly according to claim 7, wherein: The sealing ring further includes a third sealing portion, the third sealing portion abutting between the extension portion and the side wall of the second through hole, and the third sealing portion communicating with the second sealing portion; In the second direction, the thickness of the third sealing portion in an unassembled state is T3, T3>T2 and 0.1<T3 / W≤1.

1.

9. The cover plate assembly according to claim 1, wherein: In the second direction: the cross-section of the supporting portion is rectangular, circular or waist-shaped; and / or the cross-section of the extending portion is circular or waist-shaped.

10. A battery, characterized in that: The invention comprises a cover plate assembly according to any one of claims 1 to 9.

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