Sealing structure and battery

Abstract

The utility model discloses a sealing structure and a battery, the sealing structure comprises a first annular body and a second annular body, the first annular body sleeves the second annular body, and the first annular body is fixedly connected with the second annular body; wherein the material of the first annular body is different from that of the second annular body, the tensile strength Q of one of the first annular body and the second annular body is larger than or equal to 25 Mpa and smaller than or equal to 150 Mpa, and the melting point T of the other one of the first annular body and the second annular body is larger than or equal to 235 DEG C and smaller than or equal to T. The first annular body and the second annular body are made of different materials, one structure is good in extrusion resistance, the other structure is good in heat resistance, the whole sealing structure has good extrusion resistance and heat resistance, the problem of battery short circuit caused by melting or damage of an existing sealing piece is solved, and the service life of the battery is prolonged. And the safety performance of the battery is improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of batteries, and particularly relates to a sealing structure and a battery. BACKGROUND

[0002] Lithium ion batteries have the advantages of high energy density, fast charging and discharging, long cycle life, no pollution, etc., and have been widely applied in the fields of portable electronic devices, communication, energy storage and electric vehicles.

[0003] The cylindrical battery includes a cap structure, a shell and a battery cell. The cap structure includes a top cover, a sealing element, a burst disk and the like. After the cap structure is assembled with the shell and the battery cell, the sealing element is deformed under extrusion. The material of the sealing element is generally made of a single material. The single material has a low melting point or a poor structural strength, and the sealing element is damaged after being melted or extruded, so that the top cover of the battery is in contact with the shell, and a short circuit is easily caused, affecting the reliability of the battery. CONTENT OF THE UTILITY MODEL

[0004] The application provides a sealing structure and a battery to solve the problem that the existing sealing element causes a short circuit of the battery due to melting or damage.

[0005] In a first aspect, the application provides a sealing structure, comprising:

[0006] a first annular body;

[0007] a second annular body, the first annular body being sleeved on the second annular body, and the first annular body being fixedly connected with the second annular body;

[0008] wherein the material of the first annular body is different from the material of the second annular body, and the tensile strength of one of the first annular body and the second annular body is Q, and 25Mpa≤Q≤150Mpa, and the melting point of the other one is T, and 235℃≤T.

[0009] Optionally, the material of the first annular body is one of PBT material and PFA material, and the material of the second annular body is the other one of PBT material and PFA material.

[0010] Optionally, the material of the first annular body is PBT material, the material of the second annular body is PFA material, the wall thickness of the first annular body is S1, and the wall thickness of the second annular body is S2, wherein 1≤S1 / S2≤2.

[0011] Or, the material of the second annular body is PBT material, the wall thickness of the first annular body is S1, and the wall thickness of the second annular body is S2, wherein 1≤S2 / S1≤2.

[0012] Optionally, 0.5mm≤S1+S2≤0.6mm.

[0013] Optionally, the first annular body is provided with a buckle member on a side facing the second annular body, the second annular body is provided with a buckle matching member matched with the buckle member, and the first annular body and the second annular body are fixedly connected through the buckle member and the buckle matching member.

[0014] Optionally, a first sealing protrusion is arranged on a side of the second annular body away from the first annular body, and a projection of the buckle member is located in the first sealing protrusion in a direction perpendicular to an axis of the second annular body.

[0015] Optionally, the second annular body is provided with a supporting portion, and an end of the first annular body is connected to the supporting portion in a fit manner.

[0016] Optionally, in an axial direction of the second annular body, a height of the first annular body is H1, and a height of the second annular body is H2, where 0mm≤H2-H1≤0.5mm.

[0017] Optionally, 1.85mm≤H2≤5.35mm.

[0018] Optionally, the battery further comprises:

[0019] a supporting table arranged at one end of the second annular body, and connected to the second annular body;

[0020] a bottom support connected to a side of the supporting table away from the second annular body in a radial direction of the second annular body, and the second annular body, the supporting table and the bottom support form a sealed inner cavity.

[0021] Optionally, the second annular body, the supporting table and the bottom support are made of the same material.

[0022] Optionally, the second annular body, the supporting table and the bottom support are integrally formed by an injection molding process.

[0023] Optionally, an outer diameter of the supporting table is D1, and an inner diameter of the supporting table is D2, where 2.6mm≤D1-D2≤3.8mm.

[0024] Optionally, 3.75mm≤D2≤14.95; or, 16.55mm≤D2≤17.75; or, 16.95mm≤D2≤18.15.

[0025] In a second aspect, the embodiments of the present application further provide a battery, comprising:

[0026] The cap assembly comprises the sealing structure, and the inner cavity is sequentially provided with a top cover, an explosion-proof sheet, a hole plate gasket and a hole plate from top to bottom.

[0027] The shell is mounted with the electric core, and the shell is provided with a necked structure near the end portion, and the cap assembly is mounted on the necked structure and fixedly connected with the shell.

[0028] The sealing structure and the battery provided by the embodiment of the application, the sealing structure comprises a first annular body and a second annular body, the first annular body is sleeved on the second annular body, the first annular body is fixedly connected with the second annular body, the material of the first annular body is different from the material of the second annular body, the PBT material has good extrusion resistance, the tensile strength of one of the first annular body and the second annular body is Q, 25Mpa≤Q≤150Mpa, and the melting point of the other is T, 235℃≤T, so that the sealing structure has good extrusion resistance and heat resistance, the problem that the existing sealing element causes short circuit of the battery due to melting or damage is overcome, and the safety performance of the battery is improved. BRIEF DESCRIPTION OF DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the application, the following will briefly introduce the drawings needed to be used in the embodiment description. Obviously, the drawings in the following description only some embodiments of the application, and those skilled in the art can obtain other drawings according to these drawings without creative labor.

[0030] In order to more completely understand the application and its beneficial effects, the following will be described with reference to the drawings. In the following description, the same reference numerals represent the same parts.

[0031] Figure 1 The structural schematic diagram of the sealing structure provided by the embodiment of the application.

[0032] Figure 2 The sectional view of the sealing structure provided by the embodiment of the application.

[0033] Figure 3 The labeling diagram of the sealing structure provided by the embodiment of the application.

[0034] Figure 4 The side view of the battery provided by the embodiment of the application.

[0035] Figure 5 The Figure 4 A-A sectional view in the middle.

[0036] Figure 6 The Figure 5 The local enlarged view at B.

[0037] Figure 7 For Figure 6 Enlarged view of a portion at C.

[0038] Reference signs are:

[0039] 1. A battery;

[0040] 10. A cap assembly; 100, a sealing structure; 110, a first annular body; 111, a buckle member; 120, a second annular body; 121, a buckle fitting member; 122, a first sealing protrusion; 123, a supporting portion; 124, a second sealing protrusion; 130, a supporting table; 132, a first side surface; 133, a second side surface; 134, a third side surface; 140, a bottom support; 150, a sealing inner cavity;

[0041] 200, a top cover; 300, an anti-explosion sheet; 350, a first vertical plate; 400, a hole plate gasket; 500, a hole plate;

[0042] 20. A shell; 21, a necked structure; 22, a buckling edge; 30, an electric core. DETAILED DESCRIPTION

[0043] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to 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 the embodiments. Based on the embodiments in the present application, all other embodiments obtained by a person skilled in the art without creative labor fall within the scope of protection of the present application.

[0044] See Figure 1 and Figure 2The application provides a sealing structure 100, which comprises a first annular body 110 and a second annular body 120. The cross-sectional shape of the first annular body 110 is circular annular along the vertical sealing structure 100 axial direction, and the cross-sectional shape of the second annular body 120 is circular annular. The first annular body 110 is sleeved on the second annular body 120, the inner side surface of the first annular body 110 is attached to the outer side surface of the second annular body 120, and the first annular body 110 is fixedly connected with the second annular body 120. The material of the first annular body 110 is different from that of the second annular body 120, and the tensile strength of one of the first annular body 110 and the second annular body 120 is Q, 25Mpa≤Q≤150Mpa, and the melting point of the other is T, 235℃≤T. For example, the tensile strength of the first annular body 110 is Q, the tensile strength of the first annular body 110 is greater than that of the second annular body 120, the melting point of the second annular body 120 is T, and the melting point of the second annular body 120 is greater than that of the first annular body 110. Alternatively, the tensile strength of the second annular body 120 is Q, the tensile strength of the second annular body 120 is greater than that of the first annular body 110, the melting point of the first annular body 110 is T, and the melting point of the first annular body 110 is greater than that of the second annular body 120. The value of Q can be 25Mpa, 55Mpa, 65Mpa, 95Mpa, 105Mpa, 115Mpa, 125Mpa, 130Mpa, 140Mpa, 150Mpa or other values not listed. The value of T can be 235℃, 240℃, 250℃, 260℃, 310℃, 350℃, 380℃, 400℃, 450℃, 500℃ or other values listed.

[0045] In the embodiment of the application, the sealing structure 100 has the first annular body 110 and the second annular body 120, one of the first annular body 110 and the second annular body 120 has a higher melting point, and the other of the first annular body 110 and the second annular body 120 has a higher tensile strength. The sealing structure 100 has good extrusion resistance and heat resistance, overcomes the problem that the existing sealing element causes short circuit of the battery due to melting or damage, and improves the safety performance of the battery.

[0046] In some embodiments, the material of the first annular body 110 is one of PBT (polybutylene terephthalate) material and PFA (fusible polytetrafluoroethylene) material, and the material of the second annular body 120 is the other of the PBT material and the PFA material. For example, the material of the first annular body 110 is PBT material, and the material of the second annular body 120 is PFA material, or the material of the first annular body 110 is PFA material, and the material of the second annular body 120 is PBT material.

[0047] In the present application, the first annular body 110 and the second annular body 120 of the sealing structure 100 are made of different materials, and the sealing structure 100 includes PBT material and PFA material. The PBT material has good structural strength, and the PFA material has a high melting point. The sealing structure 100 has good extrusion resistance and heat resistance, overcomes the problem of short circuit of the battery caused by melting or damage of the existing sealing element, and improves the safety performance of the battery.

[0048] In some embodiments, referring to Figure 2 , the first annular body 110 is provided with a buckle 111 on one side facing the second annular body 120. The second annular body 120 is provided with a buckle matching part 121 matched with the buckle 111 on one side facing the first annular body 110. The buckle 111 and the buckle matching part 121 are arranged in position. The first annular body 110 and the second annular body 120 are fixed by clamping through the buckle 111 and the buckle matching part 121. The first annular body 110 and the second annular body 120 are fixed by clamping through the buckle 111 and the buckle matching part 121, which is simple to install, ensures the structural strength of the sealing structure 100, and improves the sealing performance of the sealing structure 100.

[0049] For example, referring to Figure 2 , the buckle 111 is a protruding structure, and the first annular body 110 is provided with a circle of protruding structures on the inner side surface close to the second annular body 120. The buckle matching part 121 is a groove structure, and the second annular body 120 is provided with a circle of groove structures on the outer side surface close to the first annular body 110, and the protruding structure and the groove structure are matched. The first annular body 110 and the second annular body 120 are assembled integrally, the protruding structure is located in the groove structure, and the protruding structure and the groove structure are tightly matched. The protruding structure has a connected upper surface and a lower surface, and the upper surface, the lower surface and the side surface of the protruding structure form a triangle. The upper surface of the protruding structure is arranged vertically to the side surface of the first annular body 110, and the lower surface of the protruding structure is arranged obliquely to form a guide slope, and the guide slope connects the side surface and the upper surface of the first annular body 110. Correspondingly, the shape of the groove structure is the same as that of the protruding structure. The lower surface of the buckle 111 is arranged obliquely to the side surface of the first annular body 110 to form a guide slope, which is beneficial to the movement of the first annular body 110 along the axial direction and the sleeving on the second annular body 120. The upper surface of the buckle 111 is arranged vertically to the side surface of the first annular body 110, the clamping area of the buckle 111 and the buckle matching part 121 is large, the clamping effect of the first annular body 110 and the second annular body 120 is ensured, and the stability of the sealing structure is improved.

[0050] In other embodiments, the buckle 111 can be a groove structure, and the buckle matching part 121 is a protruding structure. The first annular body 110 and the second annular body 120 can be clamped and integrated.

[0051] In other embodiments, the first annular body 110 and the second annular body 120 are fixedly connected by adhesion.

[0052] In some embodiments, referring to Figure 2 , the second annular body 120 is provided with a first sealing protrusion 122 on a side surface facing away from the first annular body 110. The first sealing protrusion 122 is arranged in a circle along the inner surface of the second annular body 120. In a direction perpendicular to the axis of the second annular body 120, the projection of the buckle member 111 is located within the first sealing protrusion 122. Correspondingly, the projection of the buckle fitting member 121 is located within the first sealing protrusion 122.

[0053] For example, referring to Figure 5 , Figure 6 and Figure 7 , the sealing structure is applied to a cap assembly 10, the cap assembly 10 comprising the sealing structure 100, the sealing structure 100 having a sealed inner cavity 150, the sealed inner cavity 150 sequentially provided with a top cover 200, an anti-explosion sheet 300, a hole plate gasket 400 and a hole plate 500 from top to bottom. The anti-explosion sheet 300 comprises a first vertical plate 350 located at the edge of the anti-explosion sheet 300. The first vertical plate 350 extends to the side of the top cover 200, and the inner side surface of the first vertical plate 350 is attached to the side surface of the top cover 200. The outer side surface of the first vertical plate 350 is sealingly attached to the sealing structure 100. The end surface of the first vertical plate 350 is spaced apart from the surface of the top cover 200 facing away from the anti-explosion sheet 300. The first sealing protrusion 122 abuts and seals with the end surface of the first vertical plate 350 and the side surface of the top cover 200.

[0054] In the embodiments of the present application, referring to Figure 1 , Figure 2 and Figure 7 , after the sealing structure 100 is assembled, a gap is formed between the first vertical plate 350 and the top cover 200, and the first sealing protrusion 122 fills the gap. Even if the battery is subjected to external forces such as impact and jolt, the first sealing protrusion 122 is always filled in the gap, ensuring the sealing performance of the battery. The first sealing protrusion 122 is integrally formed with the second annular body 120, and the second annular body 120 has a relatively thick wall thickness at the position where the buckle fitting member 121 is arranged. When the buckle fitting member 121 is a clamping groove structure, the second annular body 120 has sufficient wall thickness to process the buckle fitting member 121. The second annular body 120 where the buckle fitting member 121 is arranged has a relatively thick wall thickness and high structural strength. After the sealing structure 100 is assembled, the first sealing protrusion 122 is pressed flat with the inner surface of the second annular body 120, and the sealing structure 100 at the position of the first sealing protrusion 122 has a relatively large compaction density, and has good sealing effect.

[0055] In some embodiments, referring to Figure 2The second annular body 120 is provided with a supporting portion 123, and the end of the first annular body 110 is attached to the supporting portion 123.

[0056] For example, referring to Figure 2 The second annular body 120 is provided with a first attached surface and the supporting portion 123, the first attached surface extends along the axis of the second annular body 120, and the supporting portion 123 extends along the axis perpendicular to the second annular body 120. The first attached surface is attached to the inner side of the first annular body 110, and the supporting portion 123 is attached to the end surface of the first annular body 110. The width of the supporting portion 123 is less than the wall thickness of the first annular body 110. The supporting portion 123 supports and positions the first annular body 110, and facilitates the installation of the first annular body 110.

[0057] In some embodiments, the second annular body 120 is provided with a guide surface on one side facing the first annular body 110, and the guide surface is arranged at the end of the second annular body 120 away from the supporting portion 123. The guide surface is arranged obliquely, and the end of the guide surface close to the supporting portion 123 is farther away from the first annular body 110 than the other end. By arranging the guide surface on the second annular body 120, it is beneficial for the first annular body 110 to move downward from the guide surface, and the operation is simple.

[0058] For example, referring to Figure 2 and Figure 3 The material of the first annular body 110 is PBT material, the material of the second annular body 120 is PFA material, the wall thickness of the first annular body 110 is S1, and the wall thickness of the second annular body 120 is S2, wherein 1≤S1 / S2≤2. The value of S1 / S2 can be 1, 1.2, 1.5, 1.8, 2 or other values not listed.

[0059] For example, referring to Figure 2 and Figure 3 The material of the first annular body 110 is PAF material, the material of the second annular body 120 is PBT material, the wall thickness of the first annular body 110 is S1, and the wall thickness of the second annular body 120 is S2, wherein 1≤S2 / S1≤2. The value of S2 / S1 can be 1, 1.2, 1.5, 1.8, 2 or other values not listed.

[0060] In some embodiments, 0.5mm≤S1+S2≤0.6mm. The value of S1+S2 can be 0.5mm, 0.53mm, 0.55mm, 0.58mm, 0.6mm or other values not listed.

[0061] For example, the wall thickness of the sealing structure 100 is 0.6 mm, wherein the wall thickness of the PFA material is 0.2-0.3 mm, and the wall thickness of the PBT material is 0.3-0.4 mm. The wall thickness of the sealing structure 100 is 0.5 mm, wherein the wall thickness of the PFA material is 0.2 mm, and the wall thickness of the PBT material is 0.3 mm.

[0062] It is tested that the ratio of the wall thickness of the PFA material to the wall thickness of the PBT material of the sealing structure 100 meets the standard requirements of GB / T 19466-2004 and GB / T 1040-2006, and ensures that the sealing structure can meet the short circuit test and the extrusion test at the same time, and the safety of the battery is good.

[0063] In some embodiments, referring to Figure 2 and Figure 3 , along the axial direction of the second annular body 120, the height of the first annular body 110 is H1, and the height of the second annular body 120 is H2, wherein 0 mm≤H2-H1≤0.5 mm. The value of H2-H1 can be 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, or other values not listed. In the embodiments of the present application, the relationship between H1 and H2 ensures that the supporting portion 123 can be formed on the second annular body 120, which is beneficial to the thrust of the first annular body 110 and the deformation of the material after the sealing structure 100 is extruded. The maximum value of H2-H1 is 0.5 mm, so that the first annular body 110 can cover the damaged position on the second annular body 120, and the sealing effect is ensured.

[0064] In some embodiments, 1.85 mm≤H2≤5.35 mm. The value of H2 can be 1.85 mm, 1.92 mm, 2.3 mm, 3.4 mm, 4.5 mm, 5.0 mm, 5.35 mm, or other values not listed. In the embodiments of the present application, the value of H2 can meet the design requirements of the battery seal.

[0065] In some embodiments, referring to Figure 1 , Figure 2 and Figure 3 , the sealing structure 100 further comprises a supporting table 130 and a bottom support 140. The supporting table 130 is arranged at one end of the second annular body 120, and the supporting table 130 is connected with the second annular body 120. The bottom support 140 is connected with the side of the supporting table 130 away from the second annular body 120 along the radial direction of the second annular body 120, and the second annular body 120, the supporting table 130 and the bottom support 140 enclose a sealed inner cavity 150.

[0066] In some embodiments, the materials of the second annular body 120, the supporting table 130 and the bottom support 140 are the same. For example, the materials of the supporting table 130 and the bottom support 140 are both PBT material or PFA material.

[0067] In some embodiments, referring to Figure 2 , the second annular body 120, the support 130 and the base 140 are integrally formed by an injection molding process. The first annular body 110 can also be integrally formed by an injection molding process, which is convenient for processing and facilitates assembly of the first annular body 110 and the second annular body 120.

[0068] In some embodiments, referring to Figure 2 and Figure 3 , the outer diameter of the support 130 is D1, the inner diameter of the support 130 is D2, and 2.6mm≤D1-D2≤3.8mm. Wherein, the value of D1-D2 can be 2.6mm, 2.7mm, 2.8mm, 2.9mm, 3.16mm, 3.2mm, 3.3mm, 3.4mm, 3.5mm, 3.6mm, 3.7mm, 3.8mm or other unlisted values.

[0069] For example, referring to Figures 1 to 7 , the sealing structure 100 of the embodiments of the present application is applied to a battery 1. The battery 1 includes a cap assembly 10, a shell 20 and a cell 30. The shell 20 has a cylindrical structure, one end of the shell 20 is open, the cell 30 is installed in the shell 20, the cap assembly 10 is sealingly connected with the shell 20, and the cap assembly 10 seals the opening. The shell 20 includes a necked structure 21 and a flange 22. The end of the shell 20 extends inward along the radial direction of the shell 20 to form the flange 22. The flange 22 is in the form of a circular ring. The necked structure 21 is formed by concave inward along the radial direction of the shell 20 at a certain distance from the flange 22 on the shell 20. The cap assembly 10 includes the sealing structure 100, which has a sealing inner cavity 150, and the sealing inner cavity 150 has a top cover 200, an explosion-proof sheet 300, a hole plate gasket 400 and a hole plate 500 arranged in sequence from top to bottom. The cap assembly 10 is fixed between the necked structure 21 and the flange 22. The sealing structure 100 is in contact with the necked structure 21, the flange 22 and the part of the shell 20 between the necked structure 21 and the flange 22. The necked structure 21 and the flange 22 press the sealing structure 100 along the axial direction of the shell 20, so that the sealing structure 100 is sealingly connected with the top cover 200 and the explosion-proof sheet 300.

[0070] In the embodiments of the present application, the support 130 of the sealing structure 100 is sealingly in contact with the necked structure 21, and the support 130 is compressed and deformed under the action of the flange 22 and the necked structure 21. Under the size design of D1-D2, the height of the support 130 after extrusion deformation does not exceed the lower edge of the necked structure 21, and does not extrude the cell 30, so that the sealing effect is good, and the capacity of the battery can be increased.

[0071] In some embodiments, referring to Figure 3, 3.75mm≤D2≤14.95; or, 16.55mm≤D2≤17.75; or, 16.95mm≤D2≤18.15.

[0072] The value of D2 is different for different battery models. For example, 13.75mm≤D2≤14.95, the value of D2 can be 13.75mm, 13.80mm, 13.82mm, 13.86mm, 13.87mm, 13.91mm, 13.95mm or other values not listed. For example, 16.55mm≤D2≤17.75; the value of D2 can be 16.55mm, 16.80mm, 16.82mm, 16.86mm, 16.87mm, 16.91mm, 16.95mm, 17.72mm, 17.74mm, 17.75mm or other values not listed. For example, 16.95mm≤D2≤18.15. The value of D2 can be 16.95mm, 17.10mm, 17.22mm, 17.36mm, 17.57mm, 17.69mm, 17.95mm, 18.02mm, 18.10mm, 18.15mm or other values not listed. The parameter design of the sealing structure 100 meets the needs of different products, and has a wide range of applications.

[0073] In some embodiments, referring to Figure 2 The first side surface 132 is located in the sealing inner cavity 150. The angle between the plane where the first side surface 132 is located and the axis of the second annular body 120 is greater than the angle between the plane where the second side surface 133 is located and the axis of the second annular body 120.

[0074] For example, the first side surface 132 is a plane perpendicular to the axis of the second annular body 120, that is, the first side surface 132 is horizontally arranged. The second side surface 133 is obliquely arranged, and the end of the second side surface 133 close to the second annular body 120 is closer to the first side surface 132 than the other end. The inclination angle of the first side surface 132 is between 150° and 180°.

[0075] In the embodiments of the present application, the first side surface 132 of the support platform 130 is horizontally arranged, which is beneficial to the sealing connection of the explosion-proof sheet 300 and ensures the sealing effect of the sealing structure 100 and the explosion-proof sheet 300. The second side surface 133 of the support platform 130 is obliquely arranged, which is beneficial to the assembly of the sealing structure 100 and the shell 20, and facilitates the installation and disassembly of the sealing structure 100.

[0076] In some embodiments, referring to Figure 2The third side surface 134 is connected to one end of the first side surface 132 away from the second annular body 120 and connected to one side of the bottom support 140 close to the second annular body 120, and is inclined, with the end close to the first side surface 132 closer to the second annular body 120 than the other end. The included angle between the third side surface 134 and the horizontal plane on which the bottom support 140 lies ranges between 150° and 180°.

[0077] In the embodiment of the application, referring to Figure 2 , the third side surface 134 is provided and is inclined. When the sealing structure 100 is processed, a liquid injection port can be formed on the third side surface 134, which is conducive to the flow of the injection liquid and the injection molding of the sealing structure 100.

[0078] In some embodiments, referring to Figure 2 , Figure 3 and Figure 7 , the sealing structure 100 further comprises a second sealing protrusion 124 located in the sealing inner cavity 150. The second sealing protrusion 124 abuts against the side of the explosion-proof sheet 300 away from the top cover 200. In the assembled state of the sealing structure 100, the second sealing protrusion 124 is extruded and flattened to be flush with the inner surface of the second annular body 120. The compacted density at the position of the second sealing protrusion 124 is high, which improves the sealing effect of the sealing structure 100.

[0079] In the embodiment of the application, the second sealing protrusion 124 fills the gap between the explosion-proof sheet 300 and the sealing structure 100, ensures that the sealing structure 100 closely adheres to the explosion-proof sheet 300, realizes the sealing of the cap assembly 10, has good sealing effect and high reliability.

[0080] Referring to Figures 1 to 7 , the application further provides a battery comprising the cap assembly 10 and a shell 20. The cap assembly 10 comprises the above-mentioned sealing structure 100, and the sealing inner cavity 150 has the top cover 200, the explosion-proof sheet 300, the hole plate gasket 400 and the hole plate 500 arranged in the above-mentioned order from top to bottom. The shell 20 has the electric core 30 installed therein, and has the necked structure 21 close to the end portion, the cap assembly 10 is installed on the necked structure 21, and the cap assembly 10 is fixedly connected to the shell 20.

[0081] In the above-mentioned embodiments, the description of each embodiment has its own focus, and the parts not described in detail in a certain embodiment can be referred to the relevant description of other embodiments.

[0082] In the description of the present application, the terms "first", "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more features.

[0083] The sealing structure and the battery provided by the embodiments of the present application are described in detail above, and the principles and implementation manners of the present application are described by applying specific examples in this paper. The above description of the embodiments is only used to help understand the method of the present application and its core idea; meanwhile, for those skilled in the art, according to the idea of the present application, the specific implementation manners and application ranges will be changed, and in summary, the content of the specification should not be understood as a limitation of the present application.

Claims

1. A sealing structure (100), characterized in that, The utility model relates to a kind of ring-shaped bodies, comprising: First annular body (110); Second annular body (120), the first annular body (110) is sleeved on the second annular body (120), and the first annular body (110) is fixedly connected with the second annular body (120); Wherein, the material of the first annular body (110) is different from the material of the second annular body (120), and the tensile strength of one of the first annular body (110) and the second annular body (120) is Q, 25Mpa≤Q≤150Mpa, and the melting point of the other is T, 235℃≤T.

2. The seal structure (100) according to claim 1, characterized in that The material of the first annular body (110) is one of PBT material and PFA material, and the material of the second annular body (120) is the other of PBT material and PFA material.

3. The seal structure (100) of claim 2, characterized in that The material of the first annular body (110) is PBT material, the material of the second annular body (120) is PFA material, the wall thickness of the first annular body (110) is S1, and the wall thickness of the second annular body (120) is S2, wherein 1≤S1 / S2≤2. Or, the material of the first annular body (110) is PAF material, the material of the second annular body (120) is PBT material, the wall thickness of the first annular body (110) is S1, and the wall thickness of the second annular body (120) is S2, wherein 1≤S2 / S1≤2.

4. The seal structure (100) according to claim 3, characterized in that 0.5mm≤S1+S2≤0.6mm.

5. The seal structure (100) of claim 1, wherein, The side of the first annular body (110) facing the second annular body (120) is provided with a buckle piece (111), the second annular body (120) is provided with a buckle matching piece (121) matched with the buckle piece (111), and the first annular body (110) and the second annular body (120) are fixedly connected by the buckle piece (111) and the buckle matching piece (121).

6. The sealed structure (100) of claim 5, characterized in that The side surface of the second annular body (120) away from the first annular body (110) is provided with a first sealing protrusion (122), and the projection of the buckle piece (111) is located in the first sealing protrusion (122) in the direction perpendicular to the axis of the second annular body (120).

7. The sealed structure (100) of claim 1, wherein, The second annular body (120) is provided with a supporting portion (123), and the end of the first annular body (110) is connected with the supporting portion (123).

8. The sealed structure (100) of claim 1, wherein, Along the axial direction of the second annular body (120), the height of the first annular body (110) is H1, and the height of the second annular body (120) is H2, wherein 0mm≤H2-H1≤0.5mm.

9. The sealed structure (100) of claim 8, characterized in that, 1.85mm≤H2≤5.35mm.

10. The seal structure (100) according to any one of claims 1 to 9, characterized in that Further comprising: A supporting table (130) is arranged at one end of the second annular body (120), and the supporting table (130) is connected with the second annular body (120); A bottom support (140) is connected with the side of the supporting table (130) away from the second annular body (120) in the radial direction of the second annular body (120). The second annular body (120), the pedestal (130) and the bottom support (140) enclose a sealed inner cavity (150).

11. The sealed structure (100) of claim 10, characterized in that, The second annular body (120), the pedestal (130) and the bottom support (140) are made of the same material.

12. The sealed structure (100) of claim 10, wherein, The second annular body (120), the pedestal (130) and the bottom support (140) are integrally formed by an injection molding process.

13. The sealed structure (100) of claim 10, wherein, An outer diameter of the pedestal (130) is D1, an inner diameter of the pedestal (130) is D2, and 2.6mm≤D1-D2≤3.8mm.

14. The sealed structure (100) of claim 13, characterized in that, 3.75mm≤D2≤14.95; or, 16.55mm≤D2≤17.75; or, 16.95mm≤D2≤18.

15.

15. A battery, characterized by Comprise: A cap assembly (10) comprising the sealing structure (100) according to any one of claims 1 to 14, wherein the sealing structure (100) is sequentially provided with a top cover (200), an explosion-proof sheet (300), a hole plate gasket (400) and a hole plate (500) from top to bottom; A shell (20) is installed in the electric core (30), and the shell (20) is provided with a necked structure (21) near the end portion, the cap assembly (10) is installed on the necked structure (21), and the cap assembly (10) is fixedly connected with the shell (20).

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