Sealing structure, battery and battery pack

Abstract

The utility model discloses a sealing structure, a battery and a battery pack, the sealing structure comprises an annular body, a supporting table and a bottom support, the supporting table is arranged at one end of the annular body, and the supporting table is connected with the annular body; in the radial direction of the annular body, the bottom support is connected with the side, deviating from the annular body, of the supporting table, and a sealed inner cavity is defined by the annular body, the supporting table and the bottom support; wherein the outer diameter of the supporting table is D1, the inner diameter of the supporting table is D2, and D1-D2 is larger than or equal to 2.6 mm and smaller than or equal to 3.8 mm. The size of the supporting table can meet the sealing requirement of the sealing structure, the situation that the battery cell is extruded after the sealing structure is assembled is avoided, the problem that the battery cell is extruded by a sealing piece in the prior art is solved, the sealing performance is good, and the capacity of the battery cell is improved.

Description

TECHNICAL FIELD

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

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

[0003] The cylindrical battery comprises a cap structure, a shell and a battery cell and the like. The cap structure comprises 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, and the lower edge of the deformed sealing element extrudes the battery cell. In order to avoid the situation that the sealing element extrudes and damages the battery cell, the height of the battery cell needs to be reduced, which affects the capacity of the battery cell. CONTENT OF THE UTILITY MODEL

[0004] The sealing structure, the battery and the battery pack provided by the embodiments of the application solve the problem that the existing sealing element extrudes the battery cell.

[0005] In a first aspect, the embodiments of the application provide a sealing structure, comprising:

[0006] a ring-shaped body;

[0007] a supporting table arranged at one end of the ring-shaped body, the supporting table being connected with the ring-shaped body;

[0008] a bottom supporting table connected with one side of the supporting table away from the ring-shaped body along the radial direction of the ring-shaped body;

[0009] the ring-shaped body, the supporting table and the bottom supporting table form a sealed inner cavity;

[0010] wherein the outer diameter of the supporting table is D1, the inner diameter of the supporting table is D2, and 2.6mm≤D1-D2≤3.8mm.

[0011] Optionally, 13.75mm≤D2≤14.95; or, 16.55mm≤D2≤17.75; or, 16.95mm≤D2≤18.15.

[0012] Optionally, the supporting table comprises oppositely arranged first and second side surfaces, the first side surface is located in the sealed inner cavity, and the included angle formed between the plane where the first side surface is located and the axis of the ring-shaped body is greater than the included angle formed between the plane where the second side surface is located and the axis of the ring-shaped body.

[0013] Optionally, the first side surface is a plane perpendicular to the axis of the ring-shaped body, and the second side surface is arranged obliquely.

[0014] Optionally, the support table is provided with a first sealing protrusion, and the first sealing protrusion is located in the sealing inner cavity.

[0015] Optionally, when the sealing structure is in a use state, the compaction density of the first sealing protrusion on the support table is greater than the compaction density at other positions.

[0016] Optionally, the annular body is provided with a second sealing protrusion, and the second sealing protrusion is located in the sealing inner cavity and is spaced apart from the support table along the axial direction of the annular body.

[0017] Optionally, when the sealing structure is in a use state, the compaction density of the second sealing protrusion on the annular body is greater than the compaction density at other positions.

[0018] Optionally, the second sealing protrusion satisfies at least one of the following conditions:

[0019] The width of the second sealing protrusion is L1, and 0 < L1 ≤ 1.2 mm;

[0020] The distance between the second sealing protrusion and the support table is L2, and 0.8 mm ≤ L2 ≤ 1.4 mm;

[0021] The height of the second sealing protrusion protruding from the inner wall of the annular body is L3, and 0.10 mm ≤ L3 ≤ 0.25 mm.

[0022] In a second aspect, the embodiments of the present application also provide a battery, comprising:

[0023] A cap assembly comprises the sealing structure described in any one of the above, and the sealing inner cavity is sequentially provided, from top to bottom, with a top cover, an explosion-proof sheet, a hole plate gasket, and a hole plate.

[0024] A shell is mounted with the battery cell, the shell is provided with a necked structure near the end portion, the cap assembly is mounted on the necked structure, and the cap assembly is fixedly connected with the shell.

[0025] Optionally, the support table is sealingly connected to the side of the necked structure away from the battery cell, and the end of the support table close to the bottom support is located in the same plane as the side wall of the necked structure.

[0026] Optionally, the width of the sealing surface formed by the sealingly fitted support table and the necked structure is D8, and 1.2 mm ≤ D8 ≤ 1.9 mm.

[0027] Optionally, the width of the sealing surface formed by the sealingly fitted support table and the necked structure is D8, and D8 = D3 + D4 + D5,

[0028] D3 is the thickness of the sidewall of the annular body;

[0029] D4 is the thickness of the first vertical plate between the annular body and the edge of the top cover;

[0030] D5 is the distance between the plane where the edge of the top cover is located and the plane where the sidewall of the necked structure is located.

[0031] Optionally, D3, D4 and D5 at least meet one of the following conditions:

[0032] 0.45mm≤D3≤0.60mm;

[0033] 0.25mm≤D4≤0.30mm;

[0034] 0.5mm≤D5≤1.0mm.

[0035] Optionally, the width of the sealing surface formed by the sealing fit between the support and the necked structure is D8, and the deformation height of the support is D7, which satisfies the following formula:

[0036] D7=0.7452D8+0.0048.

[0037] In a third aspect, a battery pack includes the battery described above.

[0038] The sealing structure, the battery and the battery pack provided by the embodiments of the present application have the following advantages: the inner and outer diameter difference of the support is in the range of 2.6mm-3.8mm, the width of the support is shortened along the radial direction of the sealing structure, the sealing requirement of the sealing structure can be met, the situation that the sealing structure squeezes the battery cell after assembly is avoided, the problem that the existing sealing member squeezes the battery cell is overcome, the sealing performance is good, and the capacity of the battery cell is improved. BRIEF DESCRIPTION OF DRAWINGS

[0039] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0040] In order to more completely understand the present 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.

[0041] Figure 1 The cross-sectional schematic view of the sealing structure provided by the embodiments of the present application.

[0042] Figure 2A cross-sectional view of a cap assembly according to an embodiment of the present application.

[0043] Figure 3 A schematic view of a sealed structure according to an embodiment of the present application.

[0044] Figure 4 A side view of a battery according to an embodiment of the present application.

[0045] Figure 5 A Figure 4 A cross-sectional view along A-A.

[0046] Figure 6 A Figure 5 A close-up view at B.

[0047] Figure 7 A Figure 6 A close-up view at C.

[0048] Reference signs in the drawings refer to:

[0049] 1, battery; 10, cap assembly; 20, shell; 21, necked structure; 22, flange; 30, cell;

[0050] 100, sealing structure; 110, sealing cavity; 120, annular body; 121, second sealing protrusion; 130, support; 131, first sealing protrusion; 132, first side surface; 133, second side surface; 134, third side surface; 140, bottom support;

[0051] 200, top cover;

[0052] 300, explosion-proof sheet; 350, first vertical plate;

[0053] 400, hole plate gasket;

[0054] 500, hole plate. DETAILED DESCRIPTION

[0055] The technical solutions in the embodiments of the present application will be described clearly and completely 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 any creative work fall within the protection scope of the present application.

[0056] Reference is made to Figure 1The sealing structure 100 provided by the embodiments of the present application is applied to a battery, such as a cylindrical battery. The sealing structure comprises a ring-shaped body 120, a support 130 and a bottom support 140. The ring-shaped body 120 is a cylindrical structure. The support 130 is arranged at one end of the ring-shaped body 120, and the support 130 is connected with the ring-shaped body 120. The bottom support 140 extends along the radial direction of the ring-shaped body 120, and the bottom support 140 is connected with the side of the support 130 which is away from the ring-shaped body 120. The ring-shaped body 120, the support 130 and the bottom support 140 enclose a sealed inner cavity 110. 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. 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 values not listed. In some embodiments, the ring-shaped body 120, the support 130 and the bottom support 140 are integrally formed by an injection molding process, which is simple to process.

[0057] For example, Figures 1 to 7 The sealing structure 100 provided by the embodiments of the present application is applied to a battery 1, which comprises a cap assembly 10, a shell 20 and a battery cell 30. The shell 20 is a cylindrical structure, one end of the shell 20 is open, the battery cell 30 is installed in the shell 20, the cap assembly 10 is sealingly connected with the shell 20, and the cap assembly 10 blocks the opening. The shell 20 comprises 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 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. The cap assembly 10 comprises the sealing structure 100, and the sealing structure 100 has a sealed inner cavity 110. The sealing inner cavity 110 has, from top to bottom, a top cover 200, a bursting disc 300, a hole plate gasket 400 and a hole plate 500. The cap assembly 10 is fixed between the necked structure 21 and the flange 22. The sealing structure 100 is in close 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 bursting disc 300.

[0058] In the embodiments of the present application, the support 130 of the sealing structure 100 is sealingly in close 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 being extruded and deformed does not exceed the lower edge of the necked structure 21, and the support 130 will not be extruded to the battery cell 30, so that the sealing effect is good, and the capacity of the battery can be increased.

[0059] In some embodiments, 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.

[0060] In some embodiments, referring to Figure 1 , the carrier 130 includes a first side 132 and a second side 133 arranged opposite to each other, and the first side 132 is located in the sealing cavity 110. The angle between the plane where the first side 132 is located and the axis of the annular body 120 is greater than the angle between the plane where the second side 133 is located and the axis of the annular body 120.

[0061] For example, referring to Figure 1 , the first side 132 is a plane perpendicular to the axis of the annular body 120, i.e. the first side 132 is arranged horizontally. The second side 133 is arranged obliquely, and the end of the second side 133 close to the annular body 120 is closer to the first side 132 than the other end. The inclination angle of the first side 132 is between 150° and 180°.

[0062] In the embodiments of the present application, referring to Figure 1 , the first side 132 of the carrier 130 is arranged horizontally, which is beneficial to the sealing connection of the rupture disc 300 and ensures the sealing effect of the sealing structure 100 and the rupture disc 300. The second side 133 of the carrier 130 is arranged obliquely, 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.

[0063] In some embodiments, referring to Figure 1The supporting base 130 further comprises a third side surface 134, one end of the third side surface 134 is connected to the end of the first side surface 132 away from the annular body 120, and the other end is connected to the side of the bottom base 140 close to the annular body 120. The third side surface 134 is arranged obliquely, and the end of the third side surface 134 close to the first side surface 132 is closer to the annular body 120 than the other end. The included angle between the third side surface 134 and the horizontal plane on which the bottom base 140 is located is between 150° and 180°.

[0064] In the embodiments of the present application, referring to Figure 1 , the third side surface 134 is arranged obliquely. When the sealing structure 100 is processed, the liquid injection port can be arranged on the third side surface 134, which is beneficial to the flow of the injection liquid and the injection molding of the sealing structure 100.

[0065] In some embodiments, referring to Figure 2 and Figure 3 , the sealing structure 100 further comprises a first sealing protrusion 131, and the first sealing protrusion 131 is located in the sealing inner cavity 110. The first sealing protrusion 131 abuts against the side of the explosion-proof sheet 300 away from the top cover 200.

[0066] In the embodiments of the present application, the first sealing protrusion 131 fills the gap between the explosion-proof sheet 300 and the annular body 120, so as to ensure that the annular body 120 is closely attached to the explosion-proof sheet 300, realize the sealing of the cap assembly 10, and have good sealing effect and high reliability.

[0067] In some embodiments, when the sealing structure 100 is in a use state, the compaction density of the supporting base 130 at the first sealing protrusion 131 is greater than the compaction density at other positions. The compaction density refers to the material density of the supporting base 130 at each position when the sealing structure 100 is in a squeezed state. When the sealing structure 100 is in a use state, the sealing structure 100 is squeezed, and the first sealing protrusion 131 is squeezed to be flush with the surface of the supporting base 130. The supporting base 130 at the first sealing protrusion 131 is subjected to a greater squeezing force, and the material is deformed greatly after being squeezed. Therefore, the compaction density of the supporting base 130 at the first sealing protrusion 131 is greater than the compaction density at other positions, so as to improve the sealing effect.

[0068] In some embodiments, referring to Figure 2 and Figure 3 , the annular body 120 is provided with a second sealing protrusion 121, the second sealing protrusion 121 is located in the sealing inner cavity 110, and the second sealing protrusion 121 is arranged spaced apart from the supporting base 130 along the axial direction of the annular body 120.

[0069] For example, referring to Figure 2 and Figure 3The cap assembly 10 comprises a sealing structure 100, the sealing structure 100 has a sealing inner cavity 110, and the sealing inner cavity 110 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. The explosion-proof sheet 300 comprises a first vertical plate 350, and the first vertical plate 350 is located at an edge of the explosion-proof sheet 300. The first vertical plate 350 extends to the side of the top cover 200, and an inner side surface of the first vertical plate 350 is attached to a side surface of the top cover 200. An outer side surface of the first vertical plate 350 is sealingly attached to the sealing structure 100. An end surface of the first vertical plate 350 is spaced apart from a surface of the top cover 200 away from the explosion-proof sheet 300. A second sealing protrusion 121 is in abutment sealing with the end surface of the first vertical plate 350 and the side surface of the top cover 200.

[0070] A gap is formed between the first vertical plate 350 and the top cover 200, and the second sealing protrusion 121 fills the gap. Even if the battery is subjected to external forces such as impact, jolt and the like, the second sealing protrusion 121 always fills the gap, thereby ensuring the sealing performance of the battery. The first sealing protrusion 131 and the second sealing protrusion 121 form double sealing, thereby improving the reliability of the battery.

[0071] In some embodiments, when the sealing structure 100 is in a use state, the compaction density of the second sealing protrusion 121 on the annular body 120 is greater than the compaction density at other positions. The compaction density refers to the material density of the annular body 120 at different positions when the sealing structure 100 is in a squeezed state. When the sealing structure 100 is in a squeezed sealing state, the second sealing protrusion 121 is squeezed to be flush with the inner side surface of the annular body 120. The annular body 120 at the second sealing protrusion 121 is subjected to a greater squeezing force, and the material is deformed greatly. Therefore, the compaction density of the annular body 120 at the second sealing protrusion 121 is greater than the compaction density at other positions, thereby improving the sealing effect.

[0072] In some embodiments, referring to Figure 2 , along the axial direction of the sealing structure 100, the cross-sectional shape of the second sealing protrusion 121 on the cross section of the sealing structure 100 is triangular, trapezoidal, rectangular, arc-shaped or the like. Before the sealing structure 100 is assembled, the second sealing protrusion 121 satisfies at least one of the following conditions:

[0073] (1) The width of the second sealing protrusion 121 is L1, and 0 < L1≤ 1.2 mm. The value of L1 can be 0.2 mm, 0.4 mm, 0.5 mm, 0.7 mm, 0.9 mm, 1.2 mm, or other values not listed. The width of the second sealing protrusion 121 refers to the distance between the two ends of the second sealing protrusion 121 connected to the annular body 120 along the axial direction of the annular body 120. For example, the distance between the end of the second sealing protrusion 121 close to the support table 130 and the support table 130 along the axial direction of the annular body 120 is L11, and the distance between the end of the second sealing protrusion 121 away from the support table 130 and the support table 130 along the axial direction of the annular body 120 is L12, wherein 0.6 mm≤ L11 < 1.2 mm, and 1.2 mm≤ L12≤ 1.8 mm. The value of L11 can be 0.6 mm, 0.7 mm, 0.9 mm, 1.1 mm, or other values not listed. The value of L12 can be 1.2 mm, 1.4 mm, 1.6 mm, 1.7 mm, 1.8 mm, or other values not listed.

[0074] (2) The distance between the second sealing protrusion 121 and the support table 130 is L2, and 0.8 mm≤ L2≤ 1.4 mm. The value of L2 can be 0.8 mm, 0.9 mm, 1.1 mm, 1.2 mm, 1.4 mm, or other values not listed. The distance between the second sealing protrusion 121 and the support table 130 refers to the distance between the second sealing protrusion 121 and the inner wall of the support table 130 at the highest position of the annular body 120. For example, when the cross-sectional shape of the second sealing protrusion 121 is a triangle, L2 is the distance between the point of the triangle away from the support table 130 and the inside of the support table 130.

[0075] (3) The height of the second sealing protrusion 121 protruding from the inner wall of the annular body 120 is L3, and 0.10 mm≤ L3≤ 0.25 mm. The value of L3 can be 0.10 mm, 0.13 mm, 0.15 mm, 0.17 mm, 0.18 mm, 0.20 mm, 0.21 mm, 0.23 mm, 0.24 mm, or other values not listed. The width of the second sealing protrusion 121 refers to the distance between the plane virtually abutting the side of the second sealing protrusion 121 away from the annular body 120 and the plane virtually abutting the inner wall of the annular body 120.

[0076] In the embodiment of the present application, the size of the second sealing protrusion 121 is designed to meet the requirement of filling the gap between the annular body 120, the top cover 200 and the explosion-proof sheet 300 after the sealing structure 100 is assembled. The probability of the situation that the sealing effect is poor due to the small size of the second sealing protrusion 121 and the probability of the situation that a new gap is formed between the annular body 120 and the top cover 200 or the explosion-proof sheet 300 due to the large size of the second sealing protrusion 121 are reduced, and the sealing reliability of the sealing structure 100 is ensured.

[0077] Referring to Figure 4 , Figure 5 , Figure 6 and Figure 7 , the present application also provides a battery comprising the cap assembly 10, the shell 20 and the battery cell 30. The cap assembly 10 comprises the sealing structure 100 described above, and the sealing structure 100 has the sealing inner cavity 110, and the sealing inner cavity 110 has the top cover 200, the explosion-proof sheet 300, the hole plate gasket 400 and the hole plate 500 arranged in sequence from top to bottom. The shell 20 has a cylindrical structure, one end of the shell 20 is open, the battery cell 30 is installed in the shell 20, the cap assembly 10 is sealingly connected with the shell 20, and the cap assembly 10 blocks the opening. The shell 20 comprises the necked structure 21 and the 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 has a circular ring shape. The necked structure 21 is concave inward along the radial direction of the shell 20 at a position of the shell 20 away from the flange 22 by a certain distance.

[0078] In some embodiments, the support 130 is sealingly connected with the side of the necked structure 21 away from the battery cell 30, and the end of the support 130 close to the bottom support 140 is in the same plane as the side wall of the necked structure 21.

[0079] For example, referring to Figure 4 , the necked structure 21 comprises the upper side wall, the lower side wall and the inner side wall, wherein the upper side wall and the lower side wall are arranged in opposite spaced relation, the inner side wall is between the upper side wall and the lower side wall, and the inner side wall connects the ends of the upper side wall and the lower side wall away from the edge of the shell 20. The necked structure 21 has a U-shaped groove structure. The support 130 is sealingly connected with the upper side wall. The end of the support 130 close to the bottom support 140 is in the same plane as the side wall of the necked structure 21. That is, the end of the support 130 close to the bottom support 140 is in the extension plane of the inner side wall of the necked structure 21.

[0080] In the embodiment of the present application, the assembled sealing structure 100 is extruded and deformed by the necked structure 21 and the flange 22, and the size of the extruded and deformed support 130 is adapted to the size of the upper side wall of the necked structure 21, which ensures the sealing effect and reduces the probability of the situation that the battery cell 30 is extruded due to the large size of the extruded and deformed support 130, and is conducive to improving the capacity of the battery cell.

[0081] In some embodiments, referring to Figure 3 , the width of the sealing surface formed by the sealing fit between the support platform 130 and the necked structure 21 is D8, where 1.2mm≤D8≤1.9mm. That is, the width of the sealing surface formed by the sealing fit between the support platform 130 and the inner side wall of the necked structure 21 is D8. The value of D8 can be 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.9mm, or other values not listed.

[0082] In the embodiments of the present application, the width of the sealing surface formed by the sealing fit between the support platform 130 and the necked structure 21 ensures the sealing requirement while reducing the probability of the support platform 130 being excessively squeezed against the battery cell 30 due to the size of the sealing surface, which is conducive to improving the capacity of the battery cell.

[0083] In some embodiments, referring to Figure 3 , the width of the sealing surface formed by the sealing fit between the support platform 130 and the necked structure 21 is D8, which satisfies formula (1):

[0084] D8=D3+D4+D5 (1);

[0085] where D3 is the thickness of the side wall of the annular body 120;

[0086] D4 is the thickness of the first vertical plate 350;

[0087] D5 is the distance between the plane where the edge of the top cover 200 is located and the plane where the side wall of the necked structure 21 is located. That is, the horizontal distance between the plane where the edge of the top cover 200 is located and the plane where the inner side wall of the necked structure 21 is located.

[0088] In the embodiments of the present application, the width D8 of the sealing surface is related to the thickness D3 of the side wall of the annular body 120, the thickness D4 of the first vertical plate 350, and the distance D5 between the plane where the edge of the top cover 200 is located and the plane where the side wall of the necked structure 21 is located. That is, the width D8 of the sealing surface is related to the size of the inner side wall of the necked structure 21. This reduces the probability of the support platform 130 being excessively small and interfering with the necked structure 21 due to the size of the sealing surface, and reduces the probability of the support platform 130 being excessively squeezed against the battery cell 30 due to the size of the sealing surface.

[0089] In some embodiments, D3, D4, and D5 at least satisfy one of the following conditions:

[0090] (1) 0.45mm≤D3≤0.60mm, where the value of D3 can be 0.45mm, 0.55mm, 0.57mm, 0.58mm, 0.59mm, 0.6mm, or other values not listed;

[0091] (2), 0.25mm≤D4≤0.30mm, wherein the value of D4 can be 0.25mm, 0.26mm, 0.28mm, 0.29mm, 0.30mm or other values not listed;

[0092] (3), 0.5mm≤D5≤1.0mm, wherein the value of D5 can be 0.5mm, 0.6mm, 0.8mm, 0.9mm, 1.0mm or other values not listed.

[0093] In the embodiments of the present application, the size design of D3, D4 and D5 can meet the width design requirement of the sealing surface and ensure the sealing effect.

[0094] In some embodiments, referring to Figure 3 and Figure 7 , the width of the sealing surface formed by the sealing fit of the support 130 and the necked structure 21 is D8, and the deformation height of the support 130 is D7, wherein the deformation height D7 of the support 130 refers to the vertical distance between one end of the support 130 close to the annular body 120 and the other end along the axial direction of the annular body 120. Wherein D8 and D7 satisfy formula (2):

[0095] D7=0.7452D8+0.0048 (2).

[0096] In the embodiments of the present application, the linear relationship between the width of the sealing surface and the deformation height of the support 130 satisfies formula (2). The width of the sealing surface is the same as the radial dimension of the upper side wall of the necked structure 21, and when designing the product, the size of the upper side wall of the necked structure 21 can be directly obtained, and formula (2) can be substituted to obtain the deformation height of the support 130. Combined with the compression deformation amount of the sealing structure 100, the size of the sealing structure 100 can be designed. It is beneficial to product design.

[0097] The embodiments of the present application also provide a battery pack comprising the above-mentioned battery 1.

[0098] In the above embodiments, the description of each embodiment has its own emphasis, and the parts not described in detail in a certain embodiment can be referred to the related description of other embodiments.

[0099] In the description of the present application, the terms "first", "second" are only for the purpose of description, 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.

[0100] The sealing structure, the battery and the battery pack 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. 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 the above description of the embodiments should not be understood as a limitation on the present application.

Claims

1. A seal structure (100) characterized by, The sealing structure (100) comprises: a ring-shaped body (120); a supporting table (130) arranged at one end of the ring-shaped body (120), wherein the supporting table (130) is connected with the ring-shaped body (120); a bottom support (140) arranged along the radial direction of the ring-shaped body (120), wherein the bottom support (140) is connected with the side of the supporting table (130) away from the ring-shaped body (120); the ring-shaped body (120), the supporting table (130) and the bottom support (140) form a sealed inner cavity (110); wherein the outer diameter of the supporting table (130) is D1, the inner diameter of the supporting table (130) is D2, and 2.6mm≤D1-D2≤3.8mm.

2. The seal structure (100) according to claim 1, characterized in that 13.75mm≤D2≤14.95; or, 16.55mm≤D2≤17.75; or, 16.95mm≤D2≤18.

15.

3. The sealed structure (100) of claim 1, wherein, The supporting table (130) comprises oppositely arranged first and second side surfaces (132, 133), wherein the first side surface (132) is located in the sealed inner cavity (110), and the angle between the plane where the first side surface (132) is located and the axis of the ring-shaped body (120) is greater than the angle between the plane where the second side surface (133) is located and the axis of the ring-shaped body (120).

4. The sealed structure (100) of claim 3, characterized in that The first side surface (132) is a plane perpendicular to the axis of the ring-shaped body (120), and the second side surface (133) is arranged obliquely.

5. The sealed structure (100) of claim 1, wherein, The supporting table (130) is provided with a first sealing protrusion (131) located in the sealed inner cavity (110).

6. The sealed structure (100) of claim 5, characterized in that When the sealing structure (100) is in a use state, the compaction density at the first sealing protrusion (131) on the supporting table (130) is greater than the compaction density at other positions on the supporting table (130).

7. The sealed structure of claim 1, wherein The ring-shaped body (120) is provided with a second sealing protrusion (121) located in the sealed inner cavity (110) and arranged spaced apart from the supporting table (130) along the axial direction of the ring-shaped body (120).

8. The seal structure of claim 7, wherein When the sealing structure (100) is in a use state, the compaction density at the second sealing protrusion (121) on the ring-shaped body (120) is greater than the compaction density at other positions on the ring-shaped body (120).

9. The sealed structure (100) of claim 7, wherein, The second sealing protrusion (121) satisfies at least one of the following conditions: the width of the second sealing protrusion (121) is L1, and 0 the distance between the second sealing protrusion (121) and the supporting table (130) is L2, and 0.8mm≤L2≤1.4mm; the height of the second sealing protrusion (121) protruding from the inner wall of the ring-shaped body (120) is L3, and 0.10mm≤L3≤0.25mm.

10. A battery (1) characterized in that, The sealing structure (100) comprises: The cap assembly (10) comprises the sealing structure (100) as claimed in any one of claims 1 to 9, and the sealing cavity (110) 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 with 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).

11. The battery (1) according to claim 10, characterized in that The support table (130) is sealingly connected with the side of the necked structure (21) away from the electric core (30), and the end of the support table (130) close to the bottom support (140) is located in the same plane as the side wall of the necked structure (21).

12. The battery (1) according to claim 11, characterized in that The width of the sealing surface formed by the sealing fit between the support table (130) and the necked structure (21) is D8, wherein 1.2mm≤D8≤1.9mm.

13. The battery (1) according to claim 10, characterized in that The width of the sealing surface formed by the sealing fit between the support table (130) and the necked structure (21) is D8, D8=D3+D4+D5, Wherein, D3 is the thickness of the side wall of the annular body (120); D4 is the thickness of the first vertical plate (350) of the explosion-proof sheet (300) located between the annular body (120) and the edge of the top cover (200); D5 is the distance between the plane where the edge of the top cover (200) is located and the plane where the side wall of the necked structure (21) is located.

14. The battery (1) according to claim 13, characterized in that D3, D4 and D5 at least meet one of the following conditions: 0.45mm≤D3≤0.60mm; 0.25mm≤D4≤0.30mm; 0.5mm≤D5≤1.0mm.

15. The battery (1) according to claim 10, characterized in that The width of the sealing surface formed by the sealing fit between the support table (130) and the necked structure (21) is D8, the deformation height of the support table (130) is D7, and the following formula is satisfied: D7=0.7452D8+0.0048.

16. A battery pack, characterized by The battery (1) comprising the cap assembly (10) as claimed in any one of claims 10 to 15.

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