Cap structure and battery

Abstract

The utility model provides a cover cap structure and a battery. The cover cap structure comprises a cover cap assembly; the sealing ring is arranged on the cap assembly in a sleeving mode and provided with a center shaft extending in the first direction; the sealing ring comprises a first sealing part extending in the first direction. The first sealing part comprises a first outer wall, a first inner wall, a second outer wall and a second inner wall; the first inner wall and the first outer wall are arranged back to back in the second direction; the second inner wall and the second outer wall are arranged back to back in the second direction; the distance from the first outer wall to the central shaft is greater than the distance from the second outer wall to the central shaft, the vertical distance from the second outer wall to the extension line of the first outer wall is a first distance, the vertical distance from the second inner wall to the extension line of the first inner wall is a second distance, and the ratio of the first distance to the second distance is 1: (1-10), the cap assembly at least partially corresponds to the second inner wall in the second direction. The problem of external short circuit of the battery caused by easy bursting of the sealing ring by the cap assembly is solved.

Description

Technical Field

[0001] The present application relates to the field of batteries, and in particular to a cap structure and a battery. Background Art

[0002] Among the many components of lithium-ion batteries, the cap is one of the key components, and the quality of its design is directly related to the performance, liquid tightness, safety life and manufacturing cost of the battery. However, the lithium-ion battery cap seal ring of the related art is usually made of non-metallic materials such as plastic, and when assembled with the lithium-ion battery steel shell, the seal ring is usually provided with a groove on the periphery of the seal ring to prevent the deformation of metal parts such as the top cover. However, during the extrusion process, the metal parts are easily damaged by the seal ring due to the design of the groove, causing the risk of external short circuit of the battery, reducing the battery safety and battery yield. Utility Model Content

[0003] To solve the above problems, the technical solutions provided by this application are as follows:

[0004] In a first aspect, the present application provides a cap assembly for a lithium-ion battery, comprising:

[0005] cap assembly; and

[0006] A sealing ring, sleeved on the cap assembly and having a central axis extending along a first direction; the sealing ring comprises a first sealing portion extending along the first direction, and at least a portion of the cap assembly is disposed in a cavity formed by the first sealing portion;

[0007] The first sealing portion includes a first outer wall, a first inner wall disposed opposite to the first outer wall in a second direction, a second outer wall, and a second inner wall disposed opposite to the second outer wall in the second direction, the second direction is perpendicular to the first direction, the first outer wall and the second outer wall are on the same side of the first sealing portion, and the first inner wall and the second inner wall are on the same side of the first sealing portion;

[0008] The distance from the first outer wall to the central axis is greater than the distance from the second outer wall to the central axis, the vertical distance from the second outer wall to the extension line of the first outer wall is a first distance, the vertical distance from the second inner wall to the extension line of the first inner wall is a second distance, and the ratio of the first distance to the second distance is 1:(1-10), wherein the cap assembly is arranged at least partially corresponding to the second inner wall along the second direction.

[0009] In an optional embodiment of the present application, a avoidance groove is provided on the first sealing portion, the second outer wall is the inner wall of the avoidance groove, and the avoidance groove and the cap assembly are arranged at least partially corresponding to each other in the second direction.

[0010] In an optional embodiment of the present application, the sealing ring further includes a connecting wall, the connecting wall connects the first outer wall and the second outer wall, and the connecting wall is inclined relative to the first outer wall and the second outer wall.

[0011] In an optional embodiment of the present application, the sealing ring also includes a limiting portion, which is protruding from the first sealing portion, the limiting portion connects the first inner wall and the second inner wall, the orthographic projection of the limiting portion in the first direction falls on the cap assembly, and the limiting portion is configured to limit the cap assembly.

[0012] In an optional embodiment of the present application, the sealing ring further includes a second sealing portion, the second sealing portion is vertically connected to one end of the first sealing portion, and a portion of the cap assembly is supported on the second sealing portion.

[0013] In an optional embodiment of the present application, the cap assembly includes:

[0014] Orifice plate;

[0015] a bursting disk, disposed on the orifice plate; and

[0016] A top cover, disposed on the explosion-proof plate and close to the limiting portion;

[0017] Wherein, the orifice plate, the explosion-proof disc and the top cover are stacked in the first direction, and the explosion-proof disc and / or the top cover are arranged opposite to the second inner wall on a side away from the central axis.

[0018] In an optional embodiment of the present application, there is a gap between the second inner wall and the cap assembly in the second direction.

[0019] In an optional embodiment of the present application, it also includes:

[0020] An isolation ring, located between the explosion-proof disk and the orifice plate;

[0021] Wherein, the isolation ring is configured to support part of the explosion-proof disk.

[0022] In an optional embodiment of the present application, the thickness of the sealing ring in the second direction is 0.3 mm-1.0 mm.

[0023] In a second aspect, the present application provides a cap structure, comprising:

[0024] The cap assembly according to any one of the embodiments; and

[0025] A sealing ring is sleeved on the cap assembly; the sealing ring comprises a first sealing portion, and at least a portion of the cap assembly is disposed in a cavity formed by the first sealing portion;

[0026] A portion of the first sealing portion is bent along the second direction, the first sealing portion includes a first inner wall and a first outer wall, the first outer wall includes a portion extending along the second direction and another portion extending along the first direction, the first inner wall extends along the second direction, the portion of the first outer wall extending along the second direction is arranged opposite to the first inner wall, and the first direction and the second direction are perpendicular to each other; the first sealing portion also includes a second outer wall and a second inner wall extending along the first direction; wherein the second outer wall and the other portion of the first outer wall extending along the first direction are located on the same side, and the second inner wall and the first inner wall are arranged perpendicular to each other;

[0027] A vertical distance from the second outer wall to the other part of the extension line of the first outer wall along the second direction is a first distance, a vertical distance from the second inner wall to the extension line of the first inner wall along the second direction is a second distance, and a ratio of the first distance to the second distance is 1:(1-10), wherein the cap assembly is arranged to correspond at least partially to the second inner wall along the second direction.

[0028] In an optional embodiment of the present application, a cap structure further includes:

[0029] A limiting portion is protrudingly provided on the first sealing portion and connected to the cap assembly, the orthographic projection of the limiting portion in the first direction falls on the cap assembly, and the limiting portion is configured to limit the cap assembly.

[0030] In a third aspect, the present application provides a battery, comprising:

[0031] housing; and

[0032] The cap structure described in any embodiment is located inside the shell, the limiting portion is connected to the cap assembly along a first direction, and the second inner wall is connected to the cap assembly along a second direction.

[0033] In an optional embodiment of the present application, a side of the limiting portion away from the first outer wall is flush with the first inner wall along the second direction, and the first outer wall is flush with the second outer wall along the first direction.

[0034] In a fourth aspect, the present application provides a cap structure, comprising:

[0035] The cap assembly according to any one of the above items; and

[0036] A sealing ring includes a first sub-section and a second sub-section, wherein the first sub-section includes a first outer wall arranged along a second direction and a first inner wall opposite to the first outer wall, the second sub-section includes a second outer wall arranged along the first direction and a second inner wall opposite to the second outer wall, the first sub-section extends along the second direction and is bent relative to the second sub-section, the first sub-section is connected to the cap assembly along the second direction, and a part of the second sub-section extends along the first direction and is connected to the cap assembly in the second direction, wherein the vertical distance between the first inner wall and the first outer wall along the first direction is smaller than the vertical distance between the second inner wall and the second outer wall along the second direction.

[0037] In a fifth aspect, the present application provides a battery, comprising:

[0038] case;

[0039] A cap structure, wherein the cap structure is located inside the shell, and the shell includes an integrally formed first shell portion, a second shell portion, a third shell portion, a fourth shell portion and a fifth shell portion, wherein the first shell portion is connected to the first outer wall along the second direction, and the first inner wall is connected to the cap assembly along the second direction; the second shell portion extends along the first direction and is connected to a portion of the second outer wall along the second direction, and the second inner wall is connected to the cap assembly along the second direction; the third shell portion protrudes along the second direction toward a side close to the cap assembly and is connected to another portion of the second outer wall; the second shell portion is connected to the first shell portion and the third shell portion respectively, the fourth shell portion is connected to the third shell portion along the first direction, and the fifth shell portion is connected to the fourth shell portion along the second direction.

[0040] The cap structure provided by the present application includes at least the following beneficial effects: the cap structure includes: a cap assembly; and a sealing ring, which is sleeved on the cap assembly and has a central axis extending along a first direction; the sealing ring includes a first sealing portion extending along the first direction, and at least part of the cap assembly is arranged in a cavity formed by the first sealing portion; the first sealing portion includes a first outer wall, a first inner wall arranged opposite to the first outer wall in a second direction, a second outer wall and a second inner wall arranged opposite to the second outer wall in the second direction, the second direction is perpendicular to the first direction, the first outer wall and the second outer wall are on the same side of the first sealing portion, and the first inner wall and the second inner wall are on the same side of the first sealing portion; the distance from the first outer wall to the central axis is greater than the distance from the second outer wall to the central axis, the vertical distance from the second outer wall to the extension line of the first outer wall is the first distance, the vertical distance from the second inner wall to the extension line of the first inner wall is the second distance, and the ratio of the first distance to the second distance is 1:(1-10), wherein the cap assembly is arranged at least partially corresponding to the second inner wall along the second direction. The problem that the sealing ring is easily broken by the cap assembly and causes external short circuit of the battery is solved. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative work.

[0042] Figure 1 A schematic structural diagram of a cap structure provided in one embodiment of the present application;

[0043] Figure 2 for Figure 1 A partial view in FIG.

[0044] Figure 3 for Figure 1 Partial view B in FIG.

[0045] Figure 4 A schematic diagram of the structure of a sealing ring provided in one embodiment of the present application;

[0046] Figure 5A , 5B A structural schematic diagram of a cap structure provided by another embodiment of the present application;

[0047] Figure 6 A schematic diagram of a battery structure provided in any embodiment of the present application;

[0048] Figure 7 For this application Figure 6 A schematic diagram of the structure of the partial view C in FIG.

[0049] Figure 8 For this application Figure 6 and Figure 7 Schematic diagram of the structure of the sealing ring.

[0050] 1. The invention relates to a novel sealing member comprising a plurality of sealing members, wherein the plurality of sealing members are provided with a plurality of sealing members, and the plurality of sealing members are provided with plurality of sealing members. The plurality of sealing members are provided with plurality of sealing members. DETAILED DESCRIPTION

[0051] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0052] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0053] The present application may repeat reference numerals and / or reference letters in different implementations. Such repetition is for the purpose of simplicity and clarity and does not in itself indicate the relationship between the various implementations and / or settings discussed.

[0054] The cap structure provided by the present application will be described in detail below in conjunction with specific embodiments and drawings.

[0055] Embodiment 1

[0056] See also Figure 1 , Figure 2 and Figure 4 The present application provides a cap structure 100, comprising:

[0057] A cap assembly 10; and

[0058] The sealing ring 20 is sleeved on the cap assembly 10 and has a central axis extending along the first direction Y; the sealing ring 20 includes a first sealing portion 201 extending along the first direction Y, and at least a portion of the cap assembly 10 is disposed in a cavity formed by the first sealing portion 201;

[0059] The first sealing portion 201 includes a first outer wall 2011, a first inner wall 2012 disposed opposite to the first outer wall 2011 in a second direction X, a second outer wall 2013, and a second inner wall 2014 disposed opposite to the second outer wall 2013 in the second direction X, the second direction X is perpendicular to the first direction Y, the first outer wall 2011 and the second outer wall 2013 are on the same side of the first sealing portion 201, and the first inner wall 2012 and the second inner wall 2014 are on the same side of the first sealing portion 201.

[0060] See also Figure 4 , the distance from the first outer wall 2011 to the central axis is greater than the distance from the second outer wall 2013 to the central axis, the vertical distance from the second outer wall 2013 to the extension line of the first outer wall 2011 is a first distance L1, the vertical distance from the second inner wall 2014 to the extension line of the first inner wall 2012 is a second distance L2, the ratio of the first distance L1 to the second distance L2 is 1:(1-10), wherein the cap assembly 10 is arranged at least partially corresponding to the second inner wall 2014 along the second direction X.

[0061] Specifically, the distance from the first outer wall 2011 to the central axis is greater than the distance from the second outer wall 2013 to the central axis. It can be understood that there is a distance difference between the first outer wall 2011 and the second outer wall 2013, and the distance difference is based on the formation of the avoidance groove 204 (see below for details). The avoidance groove 204 is recessed along the second direction X toward the side close to the cap assembly 10, and the avoidance groove 204 has a recessed depth along the second direction X, and the recessed depth is the distance difference, that is, the first distance L1. The second outer wall 2013 is the inner wall of the avoidance groove 204, and the avoidance groove 204 has an avoidance function, which is set to prevent the sealing ring 20 from being squeezed by the shell 40 when the cap structure 100 is assembled with the battery shell 40, causing the cap assembly 10 to deform.

[0062] Furthermore, the setting of the avoidance groove 204 makes the position of the sealing ring 20 along the second direction X thinner, and the position where the sealing ring 20 is thinner is easily squeezed, thereby causing the sealing ring 20 to be damaged, affecting the safety of the battery. In order to avoid the problem of being squeezed and damaged, it is necessary to thicken the position that is easy to be damaged, and the vertical distance from the second inner wall 2014 to the extension line of the first inner wall 2012 is the thickened distance, that is, the second distance L2. It can be understood that the difference between the vertical distance from the second outer wall 2013 to the extension line of the first inner wall 2012 and the vertical distance from the second outer wall 2013 to the second inner wall 2014 is the thickness of the thickened sealing ring 20. The second distance L2 ≥ the first distance L1, that is, the thickened thickness ≥ the depth of the depression of the avoidance groove 204 along the second direction X. During the extrusion process, the cap assembly 10 is arranged corresponding to the second inner wall 2014, which means that the cap assembly 10 is arranged corresponding to the thickened position, and the position corresponding to the avoidance groove 204 is not easily squeezed by the top cover 101 and the explosion-proof plate 102, thereby solving the problem of the sealing ring 20 being damaged by squeezing.

[0063] Further, the distance between the first outer wall 2011 and the central axis is L3, and the distance between the second outer wall 2013 and the central axis is L4, that is, L3>L4. The ratio between the first distance L1 and the second distance L2 can be 1:1, that is, the increased thickness is equal to the depth of the avoidance groove 204 concave along the second direction X. The ratio between the first distance L1 and the second distance L2 can also be 1:2, 1:3, 1:4, 1:5, 1:6, 1:7, 1:8, 1:9 and 1:10, but not limited thereto, as long as it is ensured that the sealing ring 20 is not easily squeezed and does not affect the assembly effect of other parts and the sealing performance of the sealing ring 20, the specific ratio between the first distance L1 and the second distance L2 is not limited in the present application, and is subject to actual application.

[0064] Specifically, the sealing ring 20 is, for example, circular, square or other geometric shapes. The sealing ring 20 is suitable for lithium-ion square batteries, lithium-ion circular batteries or lithium-ion batteries of other shapes. The sealing ring 20 is arranged to form a cavity. The cap assembly 10 is located in the cavity. The sealing ring 20 surrounds the cap assembly 10.

[0065] See also Figure 1 and Figure 3 In an optional embodiment of the present application, a avoidance groove 204 is provided on the first sealing portion 201, the second outer wall 2013 is the inner wall of the avoidance groove 204, and the avoidance groove 204 is at least partially corresponding to the cap assembly 10 in the second direction X.

[0066] Specifically, the avoidance groove 204 is provided to prevent the cap assembly 10 from being deformed due to being squeezed by the housing 40 when being assembled with the housing 40 of the battery.

[0067] Further, based on the avoidance groove 204, the distance from the first outer wall 2011 to the central axis is greater than the distance from the second outer wall 2013 to the central axis. In one embodiment of the present application, on the basis that the distance from the first outer wall 2011 to the central axis is greater than the distance from the second outer wall 2013 to the central axis, the distance from the first inner wall 2012 to the central axis is greater than the distance from the second inner wall 2014 to the central axis, which is equivalent to thickening the thickness of the inner wall of the sealing ring 20 corresponding to the avoidance groove 204, ensuring that the sealing ring 20 will not be squeezed by the cap assembly 10 due to the design of the avoidance groove 204.

[0068] In an optional embodiment of the present application, the sealing ring 20 further includes a connecting wall 2015 , wherein the connecting wall 2015 connects the first outer wall 2011 and the second outer wall 2013 , and the connecting wall 2015 is inclined relative to the first outer wall 2011 and the second outer wall 2013 .

[0069] Exemplarily, the connecting wall 2015 may also be perpendicular to the first outer wall 2011 and the second outer wall 2013, which is subject to actual application. It can be understood that there is a distance difference between the first outer wall 2011 and the second outer wall 2013, and the connecting wall 2015 is used to adapt to the height difference between the two and connect the first outer wall 2011 and the second outer wall 2013 respectively.

[0070] In an optional embodiment of the present application, the sealing ring 20 also includes a limiting portion 202, which is protruding from the first sealing portion 201, and the limiting portion 202 connects the first inner wall 2012 and the second inner wall 2014. The orthographic projection of the limiting portion 202 in the second direction X falls on the cap assembly 10, and the limiting portion 202 is configured to limit the cap assembly 10.

[0071] Specifically, the cross-sectional area of ​​the limiting portion 202 is, for example, a triangle, a trapezoid or other geometric shapes, which is subject to actual application. Since the distance from the first inner wall 2012 to the central axis is greater than the distance from the second inner wall 2014 to the central axis, it can be understood that there is a height difference between the two. The limiting portion 202 adapts to the height difference between the two and connects the first inner wall 2012 and the second inner wall 2014 respectively. The limiting portion 202 plays a role in limiting the position of the cap assembly 10, ensuring that the cap assembly 10 will not move in the first direction Y.

[0072] Specifically, the first sealing part 201 needs to meet the sealing requirements. For example, taking the limiting part 202 as a reference, the upper compression ratio a of the sealing ring above the limiting part 202 is required to be 5%-60%, and the second sealing part 203 needs to meet the sealing requirements, that is, the lower compression ratio b of the second sealing part 203 is 10%-80%, but it is not limited to this, and the specific application shall prevail.

[0073] In an optional embodiment of the present application, the sealing ring 20 further includes a second sealing portion 203 , which is vertically connected to one end of the first sealing portion 201 , and a portion of the cap assembly 10 is supported on the second sealing portion 203 .

[0074] Specifically, the first sealing portion 201 and the second sealing portion 203 are, for example, integrally injection molded, but not limited thereto. The second sealing portion 203 is used to support part of the cap assembly 10, and the sealing ring 20 cooperates with the battery housing 40, and the sealing ring 20 is tightly attached to the cap assembly 10 to seal the battery. Figure 2 When no pressing force is applied to the shell 40, the second sealing portion 203 is a stepped structure. Exemplarily, the second sealing portion 203 may include a first sealing sub-portion 2031 and a second sealing sub-portion 2032. One end of the first sealing sub-portion 2031 is connected to the first sealing portion 201, and the other end is connected to the second sealing sub-portion 2032. There is a certain height between the first sealing sub-portion 2031 and the second sealing sub-portion 2032, and the height is adapted to the height of the orifice plate 103 and / or the isolation ring 30.

[0075] Further, the side of the explosion-proof disc 102 away from the top cover 101 is in contact with the first sealing sub-portion 2031, and a buffer portion may be provided on the side of the first sealing sub-portion 2031 facing the explosion-proof disc 102, for example, and the buffer portion protrudes toward one side of the explosion-proof disc 102, and the buffer portion is in contact with the explosion-proof disc 102, and the buffer portion is used to support the explosion-proof disc 102 and the top cover 101, and plays a supporting and buffering role. In one embodiment, the area of ​​the orifice plate 103 is smaller than the area of ​​the top cover 101 and the explosion-proof disc 102, and the orifice plate 103 is welded to the explosion-proof disc 102.

[0076] In an optional embodiment of the present application, one end of the second inner wall 2014 and the second outer wall 2013 are vertically connected to the second sealing portion 203;

[0077] A vertical distance from one end of the second inner wall 2014 away from the second sealing portion 203 to the second sealing portion 203 is greater than a vertical distance from one end of the second outer wall 2013 away from the second sealing portion 203 to the second sealing portion 203 .

[0078] Specifically, the orthographic projections of the first outer wall 2011 and the second inner wall 2014 along the second direction X partially overlap, the sealing ring 20 is thicker in the overlapping part of the orthographic projection, and the outer edge of the cap assembly 10 (for example, the top cover 101 and the explosion-proof disk 102) is located at the position where the orthographic projections of the two overlap, so that the sealing ring 20 is not easily broken by the cap assembly.

[0079] In an optional embodiment of the present application, a vertical distance between the first outer wall 2011 and the first inner wall 2012 in the second direction X is less than or equal to a vertical distance between the second outer wall 2013 and the second inner wall 2014 in the second direction X.

[0080] It can be understood that the outer edge of the cap assembly 10 is opposite to the second inner wall 2014, and the thickness of the second outer wall 2013 and the second inner wall 2014 along the second direction X is greater than the thickness of the first outer wall 2011 and the first inner wall 2012 along the second direction X, so that the part of the sealing ring 20 that contacts the cap assembly 10 is not easily broken.

[0081] In an optional embodiment of the present application, the cap assembly 10 includes:

[0082] Orifice plate 103;

[0083] The explosion-proof disk 102 is provided on the orifice plate 103; and

[0084] A top cover 101 is disposed on the explosion-proof plate 102 and close to the limiting portion 202;

[0085] The orifice plate 103, the explosion-proof disc 102 and the top cover 101 are stacked in the first direction Y, and the explosion-proof disc 102 and the top cover 101 are arranged opposite to the second inner wall 2014 on the side away from the central axis.

[0086] Specifically, the top cover 101 includes a plurality of exhaust holes 1011, which are circumferentially arranged on the top cover 101. When gas is generated inside the battery due to a short circuit or other reasons, the gas can rush out from the plurality of exhaust holes 1011, and the plurality of exhaust holes 1011 play a role in exhausting gas.

[0087] Furthermore, a support rib 1012 is provided on one side of the top cover 101 facing the explosion-proof plate 102 to support and strengthen the top cover 101 and prevent the top cover 101 from rupturing due to excessive gas pressure in the battery.

[0088] Specifically, the explosion-proof disc 102 and the top cover 101 are combined in a non-edging manner, which simplifies the manufacturing process of the explosion-proof disc 102 and the assembly process with the top cover 101. It can be understood that the outer edge of the explosion-proof disc 102 is flush with the outer edge of the top cover 101, and the explosion-proof disc 102 is welded to the top cover 101, but it is not limited to this, and the middle part of the top cover 101 is a cavity. More specifically, the explosion-proof disc 102 is, for example, a bowl-shaped structure that opens upward, and the portion of the explosion-proof disc 102 that is not welded to the top cover 101 is, for example, recessed to a side away from the top cover 101, and is partially connected to the orifice plate 103.

[0089] In an optional embodiment of the present application, a gap exists between the second inner wall 2014 and the cap assembly 10 in the second direction X.

[0090] Specifically, when the shell 40 is not assembled, the gap is used to ensure the assembly margin of the cap assembly 10. The outer edges of the top cover 101, the explosion-proof disc 102 and the orifice plate 103 of the cap assembly 10 do not abut the sealing ring 20, thereby ensuring the convenience of assembly of the top cover 101, the explosion-proof disc 102 and the orifice plate 103 with the sealing ring 20 and avoiding deformation of the top cover 101, the explosion-proof disc 102 and the orifice plate 103. When the shell 40 is assembled, the gap is squeezed by the shell 40 to play a sealing role.

[0091] In an optional embodiment of the present application, a cap structure 100 further includes:

[0092] The isolation ring 30 is located between the explosion-proof disk 102 and the orifice plate 103;

[0093] The isolation ring 30 is configured to support a portion of the explosion-proof disk 102 .

[0094] Specifically, the outer edge of the isolation ring 30 is, for example, flush with the outer edge of the orifice plate 103, and the isolation ring 30 supports part of the explosion-proof disk 102 to isolate the explosion-proof disk 102 and the outer edge of the orifice plate 103, and the middle part of the explosion-proof disk 102 and the middle part of the orifice plate 103 can be connected, for example.

[0095] In an optional embodiment of the present application, the thickness of the sealing ring 20 in the second direction X is 0.3 mm-1.0 mm, but is not limited thereto and is subject to actual application.

[0096] Embodiment 2

[0097] The cap assembly 10 of the second embodiment is the same in structure as that of the first embodiment. The difference between the first embodiment and the second embodiment lies in the sealing ring 20. The sealing ring 20 includes a first sealing portion 201, a portion of the first sealing portion 201 is bent along the second direction X, and the limiting portion 202 is located on the first sealing portion 201, and the orthographic projection in the first direction Y falls on the cap assembly 10. The cap structure 200 provided in the second embodiment of the present application will be described in detail below in conjunction with the accompanying drawings.

[0098] See also Figure 5A and Figure 5B In a second aspect, another embodiment of the present application provides a cap structure 200, comprising:

[0099] The cap assembly 10 of any embodiment; and

[0100] The sealing ring 20 is sleeved on the cap assembly 10; the sealing ring 20 includes a first sealing portion 201, and at least a portion of the cap assembly 10 is disposed in a cavity formed by the first sealing portion 201;

[0101] Part of the first sealing portion 201 is bent along the second direction X, the first sealing portion 201 includes a first inner wall 2012 and a first outer wall 2011, the first outer wall 2011 includes a portion extending along the second direction X and another portion extending along the first direction Y, the portion extending along the second direction X and the other portion extending along the first direction Y can be vertically connected, for example; the first inner wall 2012 extends along the second direction X, the portion of the first outer wall 2011 extending along the second direction X is arranged opposite to the first inner wall 2012, and the first direction Y and the second direction X are perpendicular to each other; the first sealing portion 201 also includes a second outer wall 2013 and a second inner wall 2014 extending along the first direction Y; wherein the second outer wall 2013 and the other portion of the first outer wall 2011 extending along the first direction Y are located on the same side, and the second inner wall 2014 and the first inner wall 2012 are vertically connected to each other.

[0102] The vertical distance from the second outer wall 2013 to the other part of the extension line of the first outer wall 2011 along the second direction X is a first distance L1, the vertical distance from the second inner wall 2014 to the extension line of the first inner wall 2012 along the second direction X is a second distance L2, and the ratio of the first distance L1 to the second distance L2 is 1:(1-10), wherein the cap assembly 10 is arranged at least partially corresponding to the second inner wall 2014 along the second direction X.

[0103] Specifically, since part of the first sealing portion 201 is bent along the second direction X, a part of the first outer wall 2011 also extends along the second direction X, another part of the first outer wall 2011 extends along the first direction Y and coincides with the orthographic projection of the second inner wall 2014 in the second direction X, and the first inner wall 2012 is relatively parallel to the part of the first outer wall 2011 extending along the second direction X and both extend along the second direction X.

[0104] Furthermore, the second embodiment is also provided with an avoidance groove 204, and its depth, position and function are the same as those of the first embodiment. In order to avoid the problem of damage to the sealing ring 20 due to extrusion, the position that is prone to damage needs to be thickened, and the vertical distance from the second inner wall 2014 to the extension line of the first inner wall 2012 along the second direction X is the thickened distance, that is, the second distance L2. The second distance L2 is greater than or equal to the first distance L1, that is, the thickened thickness is greater than or equal to the depth of the depression of the avoidance groove 204 along the second direction X. During the extrusion process, the cap assembly 10 is arranged corresponding to the second inner wall 2014, which means that the cap assembly 10 is arranged corresponding to the thickened part, and the position corresponding to the avoidance groove 204 is not easily squeezed and broken, which solves the problem of damage caused by extrusion of the sealing ring 20.

[0105] Furthermore, the sealing ring 20 of both the first and second embodiments has elastic deformation, and the elastic deformation of the sealing ring 20 of the second embodiment is smaller than the elastic deformation of the sealing ring 20 of the first embodiment.

[0106] In an optional embodiment of the present application, a cap structure 200 further includes:

[0107] The limiting portion 202 is protrudingly provided on the first sealing portion 201 and connected to the cap assembly 10 . The orthographic projection of the limiting portion 202 in the first direction Y falls on the cap assembly 10 . The limiting portion 202 is configured to limit the cap assembly 10 .

[0108] Furthermore, the sealing ring 20 of the second embodiment further includes a connecting wall 2015 and a second sealing portion 203 , and the structure, position and function are the same as those of the connecting wall 2015 and the second sealing portion 203 of the first embodiment, and are not further described in this embodiment.

[0109] See also Figure 6 In a third aspect, the present application provides a battery, comprising:

[0110] Housing 40; and

[0111] The cap structure described in any embodiment is located in the shell 40, the limiting portion 202 is connected to the cap assembly 10 along the first direction Y, and the second inner wall 2014 is connected to the cap assembly 10 along the second direction X.

[0112] In an optional embodiment of the present application, the side of the limiting portion 202 away from the first outer wall 2011 is flush with the first inner wall 2012 along the second direction X, and the first outer wall 2011 is flush with the second outer wall 2013 along the first direction Y.

[0113] Specifically, the shell 40 provides a clamping force to press the sealing ring 20 toward the cap assembly 10, the first inner wall 2012 fits against the upper surface of the top cover 101 and is pressed, and the second inner wall 2014 fits against the outer edges of the top cover 101 and the explosion-proof disk 102 and is pressed to ensure sealing.

[0114] Further, the limiting portion 202 and the buffer portion located at the second sealing portion 203 of the first and second embodiments can be flattened, for example, that is, the side of the limiting portion 202 away from the first outer wall 2011 is flush with the first inner wall 2012 along the second direction X; the first distance L1 between the first outer wall 2011 and the second outer wall 2013 of the first and second embodiments can also be flattened, for example, that is, the first outer wall 2011 is flush with the second outer wall 2013 along the first direction Y, for example, can be pressed by the shell 40 as shown in the attached Figure 6-Figure 8 The sealing ring 20 is in the shape of a seal.

[0115] Further, under the compression force of the housing 40, the second inner wall 2014 of the first and second embodiments, for example, partially fits the outer edges of the top cover 101 and the explosion-proof disk 102, and another part of the second inner wall 2014 fits the side of the explosion-proof disk 102 away from the top cover 101, so as to achieve sealing. The first sealing sub-portion 2031 partially fits the side of the explosion-proof disk 102 away from the top cover 101, and the second sealing sub-portion 2032 is inclined relative to the explosion-proof disk 102, and the inclined portion may not contact the orifice plate 103, which does not affect the sealing performance of the sealing ring 20.

[0116] Furthermore, based on the different elastic deformations of the sealing ring 20 in the first embodiment and the second embodiment, when the pressing force provided by the housing 40 is withdrawn, the sealing ring 20 in the first embodiment can, for example, fully rebound to the adjacent Figure 1 The sealing ring 20 of the second embodiment partially rebounds and rebounds to the adjacent Figure 5A shape.

[0117] Embodiment 3

[0118] See also Figure 6-Figure 8 In a fourth aspect, the present application provides a cap structure 300, comprising:

[0119] The cap assembly 10 of any embodiment; and

[0120] The sealing ring 20 includes a first sub-portion 205 and a second sub-portion 206, wherein the first sub-portion 205 includes a first outer wall 2011 arranged along a second direction X and a first inner wall 2012 opposite to the first outer wall 2011, and the second sub-portion 206 includes a second outer wall 2013 arranged along a first direction Y and a second inner wall 2014 opposite to the second outer wall 2013, the first sub-portion 205 extends along the second direction X and is bent relative to the second sub-portion 206, the first sub-portion 205 is connected to the cap assembly 10 along the second direction X, and part of the second sub-portion 206 extends along the first direction Y and is connected to the cap assembly 10 in the second direction X, wherein a vertical distance H1 between the first inner wall 2012 and the first outer wall 2011 along the first direction Y is less than a vertical distance H1 between the second inner wall 2014 and the second outer wall 2013 along the second direction X, that is, H1<H2.

[0121] Specifically, the second outer wall 2013 and the second inner wall 2014 in the third embodiment are curved on one side away from the first sub-portion 205, adapted to the edge shape of the top cover 101 and the explosion-proof disk 102, the second inner wall 2014 is tightly attached to the outer edges of the top cover 101 and the explosion-proof disk 102 along the second direction X, and the first inner wall 2012 is attached to the upper surface of the top cover 101 along the first direction Y, and they are pressed together to ensure their sealing performance.

[0122] Specifically, the sealing ring 20 is, for example, plastically deformed and has no resilience.

[0123] In a fifth aspect, the present application provides a battery, comprising:

[0124] Housing 40;

[0125] The cap structure 300 is located in the shell 40, and the shell 40 includes a first shell part 401, a second shell part 402, a third shell part 403, a fourth shell part 404 and a fifth shell part 405 that are integrally formed. The first shell part 401 is connected to the first outer wall 2011 along the second direction X, and the first inner wall 2012 is connected to the cap assembly 10 along the second direction X; the second shell part 402 extends along the first direction Y and is connected to a portion of the second outer wall 2011 along the second direction X. 013 is connected, the second inner wall 2014 is connected to the cap assembly 10 along the second direction X; the third shell portion 403 is protruded along the second direction X toward the side close to the cap assembly 10 and is connected to another part of the second outer wall 2013; the second shell portion 402 is respectively connected to the first shell portion 401 and the third shell portion 403, the fourth shell portion 404 is connected to the third shell portion 403 along the first direction Y, and the fifth shell portion 405 is connected to the fourth shell portion 404 along the second direction X.

[0126] Specifically, the first shell portion 401, the second shell portion 402, the third shell portion 403, the fourth shell portion 404 and the fifth shell portion 405 enclose a cavity with an opening on one side, the cap structure 300 is located at the opening and is connected to the first shell portion 401, the second shell portion 402 and the third shell portion 403, and the battery also includes a battery cell, which is located in the cavity formed by the fourth shell portion 404 and the fifth shell portion 405 and is connected to the cap structure 300.

[0127] The cap structure provided by the present application includes at least the following working process or principle: a cap assembly 10; and a sealing ring 20, which is sleeved on the cap assembly 10 and has a central axis extending along a first direction Y; the sealing ring 20 includes a first sealing portion 201 extending along the first direction Y, and at least a portion of the cap assembly 10 is arranged in a cavity formed by the first sealing portion 201; the first sealing portion 201 includes a first outer wall 2011, a first inner wall 2012 arranged opposite to the first outer wall 2011 in a second direction X, a second outer wall 2013 and a second inner wall 2014 arranged opposite to the second outer wall 2013 in the second direction X, the second direction X is perpendicular to the first direction Y, and the first outer wall 201 1 and the second outer wall 2013 are on the same side of the first sealing part 201, and the first inner wall 2012 and the second inner wall 2014 are on the same side of the first sealing part 201; the distance from the first outer wall 2011 to the central axis is greater than the distance from the second outer wall 2013 to the central axis, the vertical distance from the second outer wall 2013 to the extension line of the first outer wall 2011 is a first distance L1, and the vertical distance from the second inner wall 2014 to the extension line of the first inner wall 2012 is a second distance L2, and the ratio of the first distance L1 to the second distance L2 is 1: (1-10), wherein the cap assembly 10 is arranged at least partially corresponding to the second inner wall 2014 along the second direction X. That is, the thickness of the inner wall of the first sealing part 201 corresponding to the avoidance groove 204 is increased, and the problem that the sealing ring 20 is easily broken by the cap assembly 10 due to the design of the avoidance groove 204, resulting in an external short circuit of the battery, is solved. At the same time, the explosion-proof disc 102 and the top cover 101 adopt a non-wrapped design, which simplifies the manufacturing process of the explosion-proof disc 102 and the assembly process with the top cover 101 and the orifice plate 103.

[0128] In summary, although the present application has been disclosed as above with preferred embodiments, the above preferred embodiments are not intended to limit the present application. Ordinary technicians in this field can make various changes and modifications without departing from the spirit and scope of the present application. Therefore, the scope of protection of the present application shall be based on the scope defined in the claims.

Claims

1. A cap structure for a lithium-ion battery, characterized in that: include: Cap assembly; and A sealing ring, sleeved on the cap assembly and having a central axis extending along a first direction; the sealing ring comprises a first sealing portion extending along the first direction, and at least a portion of the cap assembly is disposed in a cavity formed by the first sealing portion; The first sealing portion includes a first outer wall, a first inner wall disposed opposite to the first outer wall in a second direction, a second outer wall, and a second inner wall disposed opposite to the second outer wall in the second direction, the second direction is perpendicular to the first direction, the first outer wall and the second outer wall are on the same side of the first sealing portion, and the first inner wall and the second inner wall are on the same side of the first sealing portion; The distance from the first outer wall to the central axis is greater than the distance from the second outer wall to the central axis, the vertical distance from the second outer wall to the extension line of the first outer wall is a first distance, the vertical distance from the second inner wall to the extension line of the first inner wall is a second distance, and the ratio of the first distance to the second distance is 1:(1-10), wherein the cap assembly is arranged at least partially corresponding to the second inner wall along the second direction.

2. The cap structure according to claim 1, characterized in that: The first sealing portion is provided with an escape groove, the second outer wall is the inner wall of the escape groove, and the escape groove and the cap assembly are at least partially arranged correspondingly in the second direction.

3. The cap structure according to claim 1, characterized in that: The sealing ring further includes a connecting wall, wherein the connecting wall connects the first outer wall and the second outer wall, and the connecting wall is inclined relative to the first outer wall and the second outer wall.

4. The cap structure according to claim 2, characterized in that: The sealing ring also includes a limiting portion, which is protruding from the first sealing portion, the limiting portion connects the first inner wall and the second inner wall, the orthographic projection of the limiting portion in the first direction falls on the cap assembly, and the limiting portion is configured to limit the cap assembly.

5. The cap structure according to claim 1, characterized in that: The sealing ring further comprises a second sealing portion, the second sealing portion is vertically connected to one end of the first sealing portion, and a portion of the cap assembly is supported on the second sealing portion.

6. The cap structure according to claim 4, characterized in that: The cap assembly comprises: Orifice plate; a bursting disk, disposed on the orifice plate; and A top cover, disposed on the explosion-proof plate and close to the limiting portion; Wherein, the orifice plate, the explosion-proof disk and the top cover are stacked in the first direction, and a side of the explosion-proof disk and / or the top cover away from the central axis is arranged opposite to the second inner wall.

7. The cap structure according to claim 1, characterized in that: A gap is formed between the second inner wall and the cap assembly in the second direction.

8. The cap structure according to claim 6, characterized in that: Also includes: An isolation ring, located between the explosion-proof disk and the orifice plate; Wherein, the isolation ring is configured to support part of the explosion-proof disk.

9. The cap structure according to any one of claims 1 to 8, characterized in that: The thickness of the sealing ring in the second direction is 0.3 mm-1.0 mm.

10. A cap structure, characterized in that: include: The cap assembly according to any one of claims 1 to 9; and A sealing ring is sleeved on the cap assembly; the sealing ring comprises a first sealing portion, and at least a portion of the cap assembly is disposed in a cavity formed by the first sealing portion; A portion of the first sealing portion is bent along the second direction, the first sealing portion includes a first inner wall and a first outer wall, the first outer wall includes a portion extending along the second direction and another portion extending along the first direction, the first inner wall extends along the second direction, the portion of the first outer wall extending along the second direction is arranged opposite to the first inner wall, and the first direction and the second direction are perpendicular to each other; the first sealing portion also includes a second outer wall and a second inner wall extending along the first direction; wherein the second outer wall and the other portion of the first outer wall extending along the first direction are located on the same side, and the second inner wall and the first inner wall are arranged perpendicular to each other; A vertical distance from the second outer wall to the other part of the extension line of the first outer wall along the second direction is a first distance, a vertical distance from the second inner wall to the extension line of the first inner wall along the second direction is a second distance, and a ratio of the first distance to the second distance is 1:(1-10), wherein the cap assembly is arranged to correspond at least partially to the second inner wall along the second direction.

11. The cap structure according to claim 10, characterized in that: Also includes: A limiting portion is protrudingly provided on the first sealing portion and connected to the cap assembly, the orthographic projection of the limiting portion in the first direction falls on the cap assembly, and the limiting portion is configured to limit the cap assembly.

12. A battery, characterized in that: include: case; and The cap structure according to any one of claims 1 to 11, wherein the cap structure is located inside the shell, the limiting portion is connected to the cap assembly along a first direction, and the second inner wall is connected to the cap assembly along a second direction.

13. The battery according to claim 12, characterized in that A side of the limiting portion away from the first outer wall is flush with the first inner wall along the second direction, and the first outer wall is flush with the second outer wall along the first direction.

14. A cap structure, characterized in that: include: The cap assembly according to any one of claims 1 to 9; and A sealing ring includes a first sub-section and a second sub-section, wherein the first sub-section includes a first outer wall arranged along a second direction and a first inner wall opposite to the first outer wall, the second sub-section includes a second outer wall arranged along the first direction and a second inner wall opposite to the second outer wall, the first sub-section extends along the second direction and is bent relative to the second sub-section, the first sub-section is connected to the cap assembly along the second direction, and a part of the second sub-section extends along the first direction and is connected to the cap assembly in the second direction, wherein the vertical distance between the first inner wall and the first outer wall along the first direction is smaller than the vertical distance between the second inner wall and the second outer wall along the second direction.

15. A battery, characterized in that: include: case; The cap structure as described in claim 14, wherein the cap structure is located inside the shell, and the shell includes an integrally formed first shell portion, a second shell portion, a third shell portion, a fourth shell portion and a fifth shell portion, the first shell portion being connected to the first outer wall along the second direction, and the first inner wall being connected to the cap assembly along the second direction; the second shell portion extending along the first direction and connected to a portion of the second outer wall along the second direction, and the second inner wall being connected to the cap assembly along the second direction; the third shell portion protruding along the second direction toward a side close to the cap assembly and connected to another portion of the second outer wall; the second shell portion being connected to the first shell portion and the third shell portion, respectively, the fourth shell portion being connected to the third shell portion along the first direction, and the fifth shell portion being connected to the fourth shell portion along the second direction.

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