Cap assembly and battery

Abstract

The utility model provides a cap assembly and a battery, the cap assembly comprises an upper cover plate and a connecting assembly, and the upper cover plate is provided with a first via hole; the connecting assembly comprises a connecting piece, a first sealing piece and a pole, the connecting piece is welded in the first via hole, the connecting piece is provided with a second via hole, the pole is arranged in the second via hole, and the first sealing piece is arranged between the pole and the connecting piece; wherein a welding face is arranged between the connecting piece and the upper cover plate, a height difference is directly arranged between the outer end face of the first sealing piece and the welding face, the height difference is L1, and L1 is larger than or equal to 0.60 mm and smaller than or equal to 1.0 mm. The utility model aims to solve the technical problem that the stability and the sealing property of the battery are influenced due to the damage of an insulating part caused by welding of the conventional battery.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a cap assembly and a battery. Background Art

[0002] Active implantable neurostimulators, the main product types currently include vagus nerve stimulators (VNS), deep brain nerve stimulators (DBS), spinal cord nerve stimulators (SCS), sacral nerve stimulators (SNS), etc. Among them, batteries, as the core power components of neurostimulators, occupy a very important position. Among them, DBS and SCS mostly use secondary lithium-ion batteries, and the battery life can generally be used for 10-15 years, or even longer. In related technologies, the battery includes a cover plate, a positive electrode assembly, an insulating part, etc. The positive electrode assembly is welded to the cover plate. During the welding process, the welding energy will affect the insulating part, causing the insulating part to be burned and damaged, affecting the stability and sealing of the battery, resulting in a reduced battery life. Utility Model Content

[0003] The embodiments of the present utility model provide a cap assembly and a battery, which are intended to solve the technical problem of existing batteries in which insulating parts are damaged due to welding, thereby affecting the stability and sealing of the battery.

[0004] In a first aspect, an embodiment of the present invention provides a cap assembly, comprising:

[0005] An upper cover plate, wherein a first through hole is provided on the upper cover plate; and

[0006] A connecting assembly, comprising a connecting member, a first sealing member, and a pole, wherein the connecting member is welded in the first through hole, the connecting member is provided with a second through hole, the pole is provided in the second through hole, and the first sealing member is provided between the pole and the connecting member;

[0007] A welding surface is provided between the connecting member and the upper cover plate, and a height difference is provided between the outer end surface of the first sealing member and the welding surface. The height difference is L1, and 0.60 mm ≤ L1 ≤ 1.0 mm.

[0008] In one embodiment, the outer end surface of the connecting member, the outer end surface of the upper cover plate and the welding surface are flush.

[0009] In one embodiment, the first sealing member and the connecting member form an upper accommodating groove, and a second sealing member is provided in the upper accommodating groove.

[0010] In one embodiment, one end of the pole protrudes from the inner end surface of the connector to form an input end, which is used to connect to the collecting plate, and the input end is arranged close to the inner end surface of the connector. The shortest distance between the inner end surface of the first seal and the inner end surface of the connector is L2, where 0.10 mm ≤ L2 ≤ 1.0 mm.

[0011] In one embodiment, a height difference is provided between an inner end surface of the first sealing member and an inner end surface of the connecting member, so that the first sealing member and the connecting member form a lower receiving groove, and a third sealing member is provided in the lower receiving groove.

[0012] In one embodiment, the other end of the pole protrudes from the outer end surface of the connector to form an output end, and the height of the output end is H2, wherein 2mm≤H2≤6mm.

[0013] In one embodiment, the outer diameter of the connecting member is D1, and the width of the upper cover plate is D2, wherein D1=aD2, a is a first coefficient, and 0.5≤a≤0.6.

[0014] In one embodiment, the inner diameter of the second through hole is D3, and the height of the connecting member is H1, wherein 2 mm ≤ D1 ≤ 3 mm, 1.4 mm ≤ D3 ≤ 2.4 mm, and 2 mm ≤ H1 ≤ 3 mm.

[0015] In one embodiment, the pole comprises any one of a Kovar pole, a molybdenum pole, and a titanium pole; and / or,

[0016] The connector includes any one of a stainless steel connector, a titanium alloy connector, and a titanium connector; and / or,

[0017] The first seal comprises a glass seal; and / or

[0018] The upper cover plate includes any one of a stainless steel upper cover plate, a titanium alloy upper cover plate, and a titanium upper cover plate.

[0019] In a second aspect, an embodiment of the present invention provides a battery, comprising the above-mentioned cap assembly, wherein the cap assembly comprises:

[0020] An upper cover plate, wherein a first through hole is provided on the upper cover plate; and

[0021] A connecting assembly, comprising a connecting member, a first sealing member, and a pole, wherein the connecting member is welded in the first through hole, the connecting member is provided with a second through hole, the pole is provided in the second through hole, and the first sealing member is provided between the pole and the connecting member;

[0022] A welding surface is provided between the connecting member and the upper cover plate, and a height difference is provided between the outer end surface of the first sealing member and the welding surface. The height difference is L1, and 0.60 mm ≤ L1 ≤ 1.0 mm.

[0023] Beneficial effects of the embodiments of the present utility model:

[0024] In the technical solution of the present utility model, the connecting member and the upper cover are connected by welding, which has a strong connection strength, making the structure of the cap assembly more stable; the first seal is arranged between the connecting member and the pole. On the one hand, the first seal plays a sealing role to prevent water vapor in the air from entering the interior of the battery, thereby protecting the battery; on the other hand, the first seal plays an insulating role to isolate the pole and the connecting member to avoid contact between the two; a height difference is set between the outer end face of the first seal and the welding surface, and the height difference is L1, 0.06mm≤L1≤1.0mm. Such a setting can prevent the welding energy generated during the welding of the connecting member and the upper cover from affecting the first seal, causing damage to the first seal and reducing the sealing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0026] Figure 1 It is a three-dimensional schematic diagram of a cap assembly provided in an embodiment of the present utility model;

[0027] Figure 2 yes Figure 1 a top view of the middle cap assembly;

[0028] Figure 3 yes Figure 2 Sectional view of AA

[0029] Figure 4 yes Figure 3 A magnified schematic diagram of B.

[0030] Explanation of Figure Numbers

[0031]

[0032] DETAILED DESCRIPTION

[0033] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention. In addition, it should be understood that the specific implementation methods described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention. In the present invention, unless otherwise specified, the directional words used, such as "upper" and "lower", generally refer to the upper and lower parts of the device in actual use or working state, specifically the drawing direction in the accompanying drawings; while "inside" and "outside" refer to the outline of the device.

[0034] Active implantable neurostimulators, the main product types currently include vagus nerve stimulators (VNS), deep brain nerve stimulators (DBS), spinal cord nerve stimulators (SCS), sacral nerve stimulators (SNS), etc. Among them, batteries, as the core power components of neurostimulators, occupy a very important position. Among them, DBS and SCS mostly use secondary lithium-ion batteries, and the battery life can generally be used for 10-15 years, or even longer. In related technologies, the battery includes a cover plate, a positive electrode assembly, an insulating part, etc. The positive electrode assembly is welded to the cover plate. During the welding process, the welding energy will affect the insulating part, causing the insulating part to be burned and damaged, affecting the stability and sealing of the battery, resulting in a reduced battery life.

[0035] In view of this, the utility model proposes a cap assembly, Figures 1 to 4 This is a structural diagram of an embodiment of the cap assembly provided by the present invention. The cap assembly provided by the present invention has stable connectivity between structures and good sealing performance. The cap assembly will be described in detail below in conjunction with the main drawings.

[0036] See also Figure 1 、 Figure 2 and Figure 3 The cap assembly 100 includes an upper cover plate 101 and a connecting assembly 103, the upper cover plate 101 is provided with a first through hole 102; the connecting assembly 103 includes a connecting piece 104, a first sealing piece 105 and a pole 106, the connecting piece 104 is welded in the first through hole 102, the connecting piece 104 is provided with a second through hole 111, the pole 106 is provided in the second through hole 111, and the first sealing piece 105 is provided between the pole 106 and the connecting piece 104; wherein, a welding surface 112 is provided between the connecting piece 104 and the upper cover plate 101, and a height difference is provided between the outer end surface of the first sealing piece 105 and the welding surface 112, and the height difference is L1, 0.06mm≤L1≤1.0mm.

[0037] In the technical solution of the present utility model, the connector 104 is connected to the upper cover plate 101 by welding, which has a strong connection strength, making the structure of the cap assembly 100 more stable; the first seal 105 is arranged between the connector 104 and the pole 106. On the one hand, the first seal 105 plays a sealing role to prevent water vapor in the air from entering the interior of the battery, thereby protecting the battery; on the other hand, the first seal 105 plays an insulating role to isolate the pole 106 and the connector 104 to prevent the two from contacting; a height difference is set between the outer end face of the first seal 105 and the welding surface 112, and the height difference is L1, 0.60mm≤L1≤1.0mm. Such a setting can prevent the welding energy generated when the connector 104 and the upper cover plate 101 are welded from affecting the first seal 105, causing damage to the first seal 105 and reducing the sealing effect.

[0038] It should be noted that when the shortest distance between the outer end surface of the first seal 105 and the upper end of the welding surface 112 is less than 0.06 mm, the outer end surface of the first seal 105 will be close to the upper end of the welding surface 112. When the connector 104 is welded to the upper cover plate 101, the welding energy will affect the first seal 105, causing it to be burned and damaged, thereby affecting the sealing performance. When the shortest distance between the outer end surface of the first seal 105 and the upper end of the welding surface 112 is greater than 1.0 mm, the first seal 105 is positioned too low, resulting in additional space being occupied. Specifically, the shortest distance between the outer end surface of the first seal 105 and the upper end of the welding surface 112 (i.e., the height difference) is 0.60mm, 0.61mm, 0.62mm, 0.63mm, 0.64mm, 0.65mm, 0.66mm, 0.67mm, 0.68mm, 0.69mm, 0.7mm, 0.71mm, 0.72mm, 0.73mm, 0.74mm, 0.75mm, 0.76mm, 0.77mm, 0.78mm, 0.79mm, 0.8mm, 0.81mm, 0.82mm, 0.83mm, 0.84mm, 0.85mm, 0.86mm, 0.87mm, 0.88mm , 0.89mm, 0.9mm, 0.91mm, 0.92mm, 0.93mm, 0.94mm, 0.95mm, 0.96mm, 0.97mm, 0.98mm, 0.99mm, 1.0mm.

[0039] Specifically, in some embodiments, when assembling the cap assembly 100, the connector 104 is first snapped into the first through hole 102 of the upper cover plate 101, and then the first seal 105 is arranged in the second through hole 111 of the connector 104. The connector 104 is provided with a third through hole, and then the pole 106 is arranged in the third through hole. After the connector 104, the pole 106 and the first seal 105 are connected, the connector 104 and the upper cover plate 101 are welded by laser welding.

[0040] Furthermore, in some embodiments, to ensure sealing, the connector 104 and the upper cover 101 are installed using an interference fit. To facilitate installation of the connector 104 and the upper cover 101, both ends of the first via 102 are chamfered, and the radius of the chamfer is 0.1 to 0.2 mm. Specifically, the radius of the chamfer can be 0.1 mm, 0.11 mm, 0.12 mm, 0.13 mm, 0.14 mm, 0.15 mm, 0.16 mm, 0.17 mm, 0.18 mm, 0.19 mm, or 0.2 mm.

[0041] In some embodiments, to facilitate installation, the connector 104 and the upper cover plate 101 are installed using a clearance fit. A gap groove is formed between the connector 104 and the upper cover plate 101. The width of the gap groove is 0.02mm to 0.03mm. Since the connector 104 and the upper cover plate 101 will be welded after pre-fixing, during the welding process, the solder melts and fills the gap groove, which not only ensures the connection strength between the connector 104 and the upper cover plate 101, but also ensures good airtightness. Specifically, the width of the gap groove is 0.02mm, 0.021mm, 0.022mm, 0.023mm, 0.024mm, 0.025mm, 0.026mm, 0.027mm, 0.028mm, 0.029mm, and 0.03mm.

[0042] It should be noted that the positional relationship between the connector 104 and the upper cover 101 is not limited. In some embodiments, the outer end surface of the connector 104 is higher than the outer end surface of the upper cover 101, the connector 104 extends beyond the first through hole 102, and the welding surface 112 is the position where the upper cover 101 contacts the side wall of the connector 104; in some embodiments, the outer end surface of the connector 104 is lower than the outer end surface of the upper cover 101, and the connector 104 is located at the upper cover 101. In the first through hole 102, the welding surface 112 is the position where the connector 104 contacts the hole wall of the first through hole 102; in some embodiments, the outer end surface of the connector 104 is flush with the outer end surface of the upper cover 101, and the shortest distance between the outer end surface of the first sealing member 105 and the outer end surface of the connector 104 is L1. This configuration makes the welding surface 112 the outer end surface of the connector 104 and the outer end surface of the upper cover 101, which facilitates welding.

[0043] See also Figure 3 and Figure 4 A height difference is set between the outer end surface of the first sealing member 105 and the outer end surface of the connecting member 104, so that the outer end surface of the first sealing member 105 and the inner side wall of the connecting member 104 enclose an upper receiving groove 107. In order to prevent water vapor and the like from entering the interior of the battery and causing corrosion to the interior of the battery, a second sealing member is provided in the upper receiving groove 107. The second sealing member is filled in the upper receiving groove 107. The second sealing member can isolate water vapor and prevent water vapor from entering through the first via 102 or the second via 111. Furthermore, the second sealing member includes a sealant. In actual operation, the sealant is injected into the upper receiving groove 107 so that the sealant is evenly filled in the upper receiving groove 107. After the sealant solidifies, it is fixed in the upper receiving groove 107.

[0044] In some embodiments, the pole 106 is used to connect to the current collecting plate of the battery. In order to ensure the stability of the connection, the pole 106 is welded to the current collecting plate. During the welding process, the welding energy will affect the first seal 105. Therefore, in order to avoid the interference of the welding energy on the first seal 105, it is necessary to limit the position of the first seal 105. For details, please refer to Figure 3 and Figure 4In this embodiment, one end of the pole 106 protrudes from the inner end surface of the connector 104 to form an input end 110. The input end 110 is used to connect to the current collecting plate. The input end 110 is located near the inner end surface of the connector 104. The shortest distance between the inner end surface of the first seal 105 and the inner end surface of the connector 104 is L2, where 0.1mm≤L2≤1.0mm. When the shortest distance between the inner end surface of the first seal 105 and the inner end surface of the connector 104 is less than 0.06mm, the inner end surface of the first seal 105 will be close to the input end 110. When the connector 104 is welded to the upper cover plate 101, the welding energy will affect the first seal 105, causing it to be burned and damaged, thereby affecting the sealing performance. When the shortest distance between the inner end surface of the first seal 105 and the inner end surface of the connector 104 is greater than 1.0 mm, the first seal 105 is positioned upward, which will occupy additional space and cause the overall size of the battery to be larger. Specifically, the shortest distance between the inner end surface of the first sealing member 105 and the inner end surface of the connecting member 104 is 0.10 mm, 0.11 mm, 0.12 mm, 0.13 mm, 0.14 mm, 0.15 mm, 0.16 mm, 0.17 mm, 0.18 mm, 0.19 mm, 0.2 mm, 0.22 mm, 0.25 mm, 0.28 mm, 0.30 mm, 0.35 mm, 0.4 mm, 0.45 mm, 0.55 mm, 0.6 mm, 0.65 mm, 0.7 mm, 0.75 mm, 0.8 mm, 0.85 mm, 0.9 mm, 0.91 mm, 0.92 mm, 0.93 mm, 0.94 mm, 0.95 mm, 0.96 mm, 0.97 mm, 0.98 mm, 0.99 mm, and 1.0 mm.

[0045] In some embodiments, see Figure 3 and Figure 4A height difference is set between the inner end surface of the first sealing member 105 and the inner end surface of the connecting member 104, so that the inner end surface of the first sealing member 105 and the inner side wall of the connecting member 104 enclose a lower receiving groove 108. In order to prevent water vapor and the like from entering the interior of the battery and causing corrosion to the interior of the battery, a third sealing member is provided in the lower receiving groove 108. The third sealing member is filled in the upper receiving groove 107. The third sealing member can isolate water vapor and prevent water vapor from entering through the first through hole 102 or the second through hole 111. Furthermore, the third sealing member includes sealant. In actual operation, the cap assembly 100 is first turned upside down so that the notch of the lower receiving groove 108 is set upward, and then the sealant is injected into the lower receiving groove 108 so that the sealant is evenly filled in the lower receiving groove 108. The sealant is then fixed in the lower receiving groove 108 after solidification.

[0046] Furthermore, in this embodiment, the cap assembly 100 has triple sealing protection, the first layer is the second seal, the second layer is the first seal 105, and the third layer is the third seal. The three cooperate with each other to isolate water vapor and prevent water vapor from entering the interior of the battery.

[0047] Furthermore, one function of the second seal and the third seal is to seal and isolate water vapor, and the other function is to fix the two ends of the pole 106 respectively to prevent it from shaking and improve the stability of the cap assembly 100.

[0048] In some embodiments, the other end of the pole 106 protrudes from the outer end surface of the connector 104 to form an output end 109, and the height of the output end 109 is H2, wherein 2mm≤H2≤6mm. It should be noted that the height of the output end 109 should not be too high or too short; when the height of the output end 109 is less than 2mm, it will affect the welding of the connector 104 and the upper cover 101. When the height of the output end 109 is too low, the output end 109 will be close to the welding surface 112. During the welding process, the welding energy will affect the output end 109, causing the output end 109 to be deformed and damaged. When the height of the output end 109 is greater than 6mm, the output end 109 is too long, resulting in the overall size of the cap assembly 100 being too large and the occupied space being increased. Specifically, in this embodiment, the height of the output end 109 is 2.0mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, 2.5mm, 2.6mm, 2.7mm, 2.8mm, 2.9mm, 3.0mm, 3.1mm, 3.2mm, 3.4mm, 3.5mm, 3.6mm, 3.8mm, 4.0mm, 4.2mm, 4.6mm, 4.8mm, 5.0mm, 5.2mm, 5.4mm, 5.5mm, 5.6mm, 5.8mm, and 6.0mm.

[0049] It should be noted that if the outer diameter of the connector 104 is too large, welding the connector 104 to the upper cover 101 will be difficult. If the outer diameter of the connector 104 is too small, the overall size of the connector 104 will be too small, the size of the second via 111 will be correspondingly reduced, and the distance between the connector 104 and the terminal 106 will be reduced, posing a risk of short circuit. Specifically, in this embodiment, the outer diameter of the connector 104 is D1, and the width of the upper cover 101 is D2, where D1 = aD2, a is a first coefficient, 0.5 ≤ a ≤ 0.6. More specifically, 2 mm ≤ D1 ≤ 3 mm. When the outer diameter of the connector 104 is greater than 3 mm, the connector 104 is thick and difficult to weld. When the outer diameter of the connector 104 is less than 2 mm, the distance between the connector 104 and the terminal 106 is reduced, which may cause a short circuit. More specifically, in some embodiments, the outer diameter of the connector 104 may be 2.0 mm, 2.1 mm, 2.2 mm, 2.3 mm, 2.4 mm, 2.5 mm, 2.6 mm, 2.7 mm, 2.8 mm, 2.9 mm, or 3.0 mm. As a preferred embodiment, the outer diameter of the connector 104 is 2.4 mm, which does not affect welding and ensures airtightness.

[0050] In some embodiments, the inner diameter of the second via 111 is D3, where 1.4 mm ≤ D3 ≤ 2.4 mm. When the inner diameter of the second via 111 is less than 1.4 mm, the distance between the connector 104 and the pole 106 is reduced, resulting in a reduction in the size of the first seal 105, affecting the sealing effect. When the distance between the pole 106 and the connector 104 is small, there is a risk of short circuit. When the inner diameter of the second via 111 is too large, the wall thickness of the connector 104 is reduced, the connector 104 is insufficiently strong, and is easily damaged. Specifically, the inner diameter of the second via 111 can be 1.4 mm, 1.5 mm, 1.6 mm, 1.7 mm, 1.8 mm, 1.9 mm, 2.0 mm, 2.1 mm, 2.2 mm, 2.3 mm, or 2.4 mm.

[0051] In some embodiments, the height of the connector 104 is H1, where 2mm≤H1≤3mm. When the height of the connector 104 is less than 2mm, the outer end surface and the inner end surface of the connector 104 will be close to the first seal 105, which will affect the first seal 105 during the welding process. When the height of the connector 104 is greater than 3mm, the overall size of the cap assembly 100 will be larger, and the space occupied will increase. Specifically, the height of the connector 104 can be 2.1mm, 2.2mm, 2.3mm, 2.4mm, 2.5mm, 2.6mm, 2.7mm, 2.8mm, 2.9mm, or 3.0mm.

[0052] Furthermore, the specific materials of the pole 106, the connector 104 and the upper cover 101 are not limited. When selecting a specific material, the application environment needs to be examined. For example, in this embodiment, the battery cap is mainly used for human implantation. Therefore, the materials of the pole 106, the connector 104 and the upper cover 101 need to meet the requirements of good corrosion resistance, good biocompatibility, and the material itself is non-magnetic.

[0053] Specifically, in some embodiments, the pole 106 includes any one of a Kovar pole, a molybdenum pole, and a titanium pole. Furthermore, the pole 106 may be a 4J28 pole (4J28 is the specific grade of the alloy) or a 4J29 pole (4J29 is the specific grade of the alloy). In a preferred embodiment, the pole 106 is a titanium pole. Titanium has excellent corrosion resistance, good biocompatibility, and is inherently non-magnetic. In another preferred embodiment, the pole 106 is a molybdenum pole. Molybdenum has excellent corrosion resistance and is inherently non-magnetic.

[0054] In some embodiments, the connector 104 may be any one of a stainless steel connector, a titanium alloy connector, or a titanium connector. Further, the connector 104 may be a SUS304 connector, a TA1 connector, a TA2 connector, or a TC4 connector.

[0055] In some embodiments, the upper cover plate 101 includes any one of a stainless steel upper cover plate, a titanium alloy upper cover plate, and a titanium upper cover plate. Furthermore, the upper cover plate 101 can be a SUS304 upper cover plate, a TA1 upper cover plate, a TA2 upper cover plate, or a TC4 upper cover plate.

[0056] It should be noted that the materials of the connector 104 and the upper cover 101 can be the same or different, depending on the actual situation. In this embodiment, since the connector 104 and the upper cover 101 are connected by welding, in order to facilitate the welding operation, the material of the connector 104 and the upper cover 101 is selected to be the same. For example, in one embodiment, considering the welding problem of the connector 104 and the upper cover 101 and the material problem of the pole 106, the upper cover 101 is a TA1 upper cover, the connector 104 is a TA1 connector, and the pole 106 is a TA1 pole.

[0057] In some embodiments, the first sealing member 105 includes a glass sealing member. It should be noted that the specific type of the glass is not limited and can be configured in accordance with conventional techniques in the art.

[0058] The present invention also provides a battery including a cap assembly 100. The specific structure of the cap assembly 100 is similar to the above embodiments. Since the present battery adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described in detail here.

[0059] Furthermore, the battery further comprises a shell and a winding core, wherein a receiving cavity is formed in the shell, the winding core is disposed in the receiving cavity, and the cover assembly is disposed at the opening of the receiving cavity; the battery assembly process requires sealing. In this embodiment, the packaging method adopts compression sealing, and the helium test air tightness permeability is ≤1×10 -9 Pa.m 3 / s, such an arrangement makes the structure of the battery more stable and the service life can reach more than 10 years.

[0060] The above is a detailed introduction to the embodiments of the present invention. Specific examples are used in this article to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method and core idea of ​​the present invention. At the same time, for those skilled in the art, based on the idea of ​​the present invention, there will be changes in the specific implementation methods and application scope. In summary, the contents of this specification should not be understood as limiting the present invention.

Claims

1. A cap assembly, characterized in that: include: An upper cover plate, wherein a first through hole is provided on the upper cover plate; and A connection assembly, comprising a connection member, a first sealing member and a pole, wherein the connection member is welded in the first through hole, the connection member is provided with a second through hole, the pole is provided in the second through hole, and the first sealing member is provided between the pole and the connection member; A welding surface is provided between the connecting member and the upper cover plate, and a height difference is provided between the outer end surface of the first sealing member and the welding surface, wherein the height difference is L1, and 0.60 mm ≤ L1 ≤ 1.0 mm.

2. The cap assembly according to claim 1, characterized in that: The outer end surface of the connecting piece, the outer end surface of the upper cover plate and the welding surface are flush.

3. The cap assembly according to claim 2, characterized in that: The first sealing member and the connecting member form an upper accommodating groove, and a second sealing member is arranged in the upper accommodating groove.

4. The cap assembly according to claim 1, characterized in that: One end of the pole protrudes from the inner end surface of the connector to form an input end, which is used to connect to the collecting plate, and the input end is arranged close to the inner end surface of the connector, and the shortest distance between the inner end surface of the first seal and the inner end surface of the connector is L2, wherein 0.10mm≤L2≤1.0mm.

5. The cap assembly according to claim 4, characterized in that: A height difference is provided between the inner end surface of the first sealing member and the inner end surface of the connecting member, so that the first sealing member and the connecting member form a lower accommodating groove, and a third sealing member is provided in the lower accommodating groove.

6. The cap assembly according to claim 4, characterized in that: The other end of the pole protrudes out of the outer end surface of the connecting piece to form an output end, and the height of the output end is H2, wherein 2mm≤H2≤6mm.

7. The cap assembly according to any one of claims 1 to 6, characterized in that: The outer diameter of the connecting member is D1, and the width of the upper cover plate is D2, wherein D1=aD2, a is the first coefficient, 0.5≤a≤0.

6.

8. The cap assembly according to claim 7, characterized in that: The inner diameter of the second via hole is D3, and the height of the connecting member is H1, wherein 2mm≤D1≤3mm, 1.4mm≤D3≤2.4mm, and 2mm≤H1≤3mm.

9. The cap assembly according to any one of claims 1 to 6, characterized in that: The pole includes any one of a Kovar pole, a molybdenum pole, and a titanium pole; and / or, The connector includes any one of a stainless steel connector, a titanium alloy connector, and a titanium connector; and / or, The first seal comprises a glass seal; and / or The upper cover plate includes any one of a stainless steel upper cover plate, a titanium alloy upper cover plate, and a titanium upper cover plate.

10. A battery, characterized in that: Comprising a cap assembly as described in any one of claims 1-9.

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