Sealing structure, cover plate assembly and battery

Abstract

The application provides a sealing structure, a cover plate assembly and a battery. The sealing structure comprises a connecting piece and a sealing piece. The connecting piece is used for connecting with a cover of the battery. A connecting groove is arranged on one side of the connecting piece along a first direction. The area of the connecting groove in a cross section perpendicular to the first direction gradually decreases along the first direction. The sealing piece is arranged on one side of the connecting piece along the first direction. The sealing piece comprises a connecting part which is inserted into the connecting groove and is matched with the shape of the connecting groove. The sealing piece further comprises a sealing part which is connected with the connecting part. The sealing part is used for being inserted into a liquid injection hole of the cover to seal the liquid injection hole. According to the application, the connecting groove is arranged on one side of the connecting piece along the first direction. The area of the connecting groove in a cross section perpendicular to the first direction gradually decreases along the first direction. The connecting part of the sealing piece is inserted into the connecting groove and is matched with the shape of the connecting groove. The risk that the connecting part of the sealing piece is pulled out of the connecting groove is reduced. The connection stability of the connecting piece and the sealing piece is improved.

Description

Technical Field

[0001] This application relates to the field of battery technology, specifically to a sealing structure, a cover plate assembly, and a battery. Background Technology

[0002] Battery cover assemblies typically have an injection hole on their caps. After electrolyte is injected into the battery through this hole, it needs to be sealed using a sealing structure to prevent leakage. In related technologies, a sealing element is usually used to seal the injection hole, and a connector is welded to the cap to limit the seal and provide a secondary seal for the injection hole.

[0003] However, the sealing process of the sealing structure in the relevant technology is relatively complicated, which affects the assembly efficiency of the battery. Utility Model Content

[0004] The embodiments of this application provide a sealing structure, a cover plate assembly, and a battery, which can improve the technical problem that the process of sealing the liquid injection hole in the sealing structure is relatively cumbersome and affects the battery assembly efficiency.

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

[0006] A connector for connecting to a battery cover, the connector having a connecting groove on one side along a first direction, the area of ​​the connecting groove in a cross section perpendicular to the first direction gradually decreasing along the first direction;

[0007] A sealing element is located on one side of the connector along the first direction. The sealing element includes a connecting portion that is inserted into the connecting groove and adapted to the shape of the connecting groove. The sealing element also includes a sealing portion connected to the connecting portion. The sealing portion is used to insert into the injection hole of the cap to seal the injection hole.

[0008] In some embodiments, the inner circumferential surface of the connecting groove is a tapered surface, and the inner diameter of the connecting groove gradually decreases along the first direction. Therefore, after the inner circumferential surface of the connecting groove abuts against the outer circumferential surface of the connecting portion of the seal, it can effectively limit the connecting portion of the seal and prevent it from dislodging from the connecting groove.

[0009] In some embodiments, the connector has a first side surface on one side along a second direction, the second direction being opposite to the first direction; the distance between the first side surface and the bottom surface of the connecting groove is B1, the connector has a second side surface on one side along the first direction, and the distance between the first side surface and the second side surface is B2.

[0010] Where 0.5≤B1 / B2≤0.75, the connector can have high strength while the inner circumferential surface of the connecting groove can stably limit the sealing part of the seal, thus giving the connector and seal high connection stability; and / or,

[0011] Among them, 0.2mm≤B1≤0.6mm is used to ensure that the connector has high strength while being able to connect stably with the seal; 0.6mm≤B2≤1mm is used to ensure that the connector has high strength, thereby improving the connection stability between the connector and the cover.

[0012] In some embodiments, the total length of the sealing structure in the first direction is B3;

[0013] Where 3≤B3 / B2≤6, the sealing portion of the sealant has sufficient length in the first direction, resulting in a better sealing effect on the injection hole. Simultaneously, it also prevents the sealing portion from being excessively long in the first direction and compressing the battery cell pack; and / or,

[0014] Specifically, 2mm ≤ B3 ≤ 5mm is used to ensure that the sealing part of the seal has sufficient length in the first direction, resulting in a better sealing effect on the injection hole. At the same time, it also prevents the sealing part from being too long in the first direction and compressing the battery cell pack.

[0015] In some embodiments, the outer diameter of the sealing portion is A1, wherein 2mm ≤ A1 ≤ 6mm. This allows the sealing portion of the seal to have a sufficient outer diameter, enabling a stable interference fit between the sealing portion and the injection hole to effectively seal the injection hole; simultaneously, the seal can be inserted into the injection hole relatively smoothly.

[0016] In some embodiments, the connector has a second side surface on one side along the first direction, the outer diameter of the second side surface being A2, wherein 4.5mm ≤ A2 ≤ 9.5mm. This allows the connector to have a larger size, facilitating welding the connector to the cap.

[0017] In some embodiments, the connector has a first side surface along a second direction, which is opposite to the first direction; the outer diameter of the first side surface is A3, where 5mm ≤ A3 ≤ 10mm. This allows the first side surface of the connector to have a larger diameter, which is beneficial for improving the connection strength between the connector and the cap.

[0018] In some embodiments, the minimum distance from the edge of the connector on one side along the first direction to the sealing part is A4, wherein 1.5≤A4≤6mm, so that the sealing part of the seal has a good sealing effect on the injection hole, while the connector can stably abut against the bottom surface of the mounting groove.

[0019] In some embodiments, the outer peripheral surface of the connector is a tapered surface, and the outer diameter of the connector gradually decreases along the first direction. This allows the connector to have a certain degree of error prevention while also making processing easier.

[0020] Secondly, embodiments of this application provide a cover plate assembly, comprising:

[0021] The cap includes a top side and a bottom side distributed along a first direction, wherein the top side of the cap has an installation groove and the bottom surface of the installation groove has a through injection hole;

[0022] A sealing structure, as described above, includes a connector and a seal. The connector is used to connect to the battery cover and is installed in the mounting groove. The connector has a connecting groove on one side along a first direction, and the area of ​​the connecting groove in the cross-section perpendicular to the first direction gradually decreases along the first direction. The seal is located on the side of the connector along the first direction and includes a connecting portion that is inserted into the connecting groove and adapted to the shape of the connecting groove. The seal also includes a sealing portion connected to the connecting portion, which is used to insert into the liquid injection hole of the cover to seal the liquid injection hole.

[0023] In some embodiments, the assembly gap between the outer peripheral surface of the connector and the inner peripheral surface of the mounting groove is N1, wherein 0.05mm ≤ N1 ≤ 0.1mm. This allows for easier installation of the connector into the mounting groove, while the mounting groove accurately positions the connector, facilitating welding between the connector and the cover.

[0024] In some embodiments, one side of the connector along the first direction abuts against the bottom surface of the mounting groove; the distance between the first side and the second side of the connector is B2, and the depth of the mounting groove is H1, wherein H1 ≥ B2. This allows the connector to be completely contained within the mounting groove, preventing it from protruding from the top surface of the cover and reducing the risk of damage to the connector after impact.

[0025] In some embodiments, the difference between the distance B2 between the first and second sides of the connector and the depth H1 of the mounting groove is M1, wherein 0.05mm ≤ M1 ≤ 0.3mm. This avoids the connector protruding from the top surface of the cover while maximizing the thickness of the connector, thereby increasing its strength.

[0026] In some embodiments, the edge of the connector is welded to the edge of the mounting groove to improve the connection strength between the connector and the cover.

[0027] Thirdly, embodiments of this application provide a battery including the cover assembly described above.

[0028] The beneficial effects of the embodiments of this application are as follows:

[0029] This embodiment of the application provides a connecting groove on one side of the connector of the sealing structure along the first direction, and makes the area of ​​the connecting groove in the cross section perpendicular to the first direction gradually decrease along the first direction. At the same time, the sealing element of the sealing structure is located on one side of the connector along the first direction, and the connecting part of the sealing element is inserted into the connecting groove of the connector, and the shape of the connecting part is adapted to the connecting groove. This can reduce the risk of the connecting part of the sealing element coming out of the connecting groove and improve the connection stability between the connector and the sealing element.

[0030] When using a sealing structure to seal the liquid injection hole of the cover, the connector of the sealing structure can be installed in the mounting groove and connected to the cover of the battery, so that the seal can be inserted into the liquid injection hole of the cover to seal the liquid injection hole. The process of sealing the liquid injection hole is relatively simple, which can improve the battery assembly efficiency, and the structure of the sealing structure is relatively simple. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0032] Figure 1 A schematic diagram of the structure of one embodiment of the battery provided in this application;

[0033] Figure 2 A cross-sectional view of one embodiment of the cover plate assembly provided in this application, wherein the connector of the sealing structure is welded to the cover;

[0034] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0035] Figure 4 A schematic diagram of one embodiment of the sealing structure provided in this application;

[0036] Figure 5 for Figure 4 A cross-sectional view along the AA direction;

[0037] Figure 6 This is a partial structural diagram of one embodiment of the cover plate assembly provided in this application, wherein the connector of the sealing structure is not welded to the cover.

[0038] Explanation of reference numerals in the attached figures:

[0039] 1-Battery; 10-Casing; 20-Cover assembly; 21-Positive terminal; 22-Negative terminal; 23-Cap; 231-Top side; 232-Bottom side; 233-Mounting groove; 2333-Bottom surface; 234-Injection hole; 24-Seal; 241-Connecting part; 242-Sealing part; 25-Connecting part; 251-Connecting groove; 253-Weld; 254-First side surface; 255-Groove bottom surface; 256-Second side surface; 26-Sealing structure; 30-Casing; Z-First direction; Q-Second direction. Detailed Implementation

[0040] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application. In addition, it should be understood that the specific embodiments described herein are only for illustration and explanation of this application and are not intended to limit this application. In this application, unless otherwise stated, directional terms such as "upper" and "lower" generally refer to the upper and lower positions of the device in actual use or operation, specifically the drawing directions in the accompanying drawings; while "inner" and "outer" refer to the outline of the device.

[0041] This application provides a cover plate assembly and a battery. These will be described in detail below.

[0042] Figure 1 This is a schematic diagram of the structure of one embodiment of the battery provided in this application. Figure 1 As shown, battery 1 includes a casing 10 and a core pack (not shown in the figure). The casing 10 includes a cover assembly 20 and a housing 30, which are connected and enclose to form a cavity, within which the core pack is disposed. The cover assembly 20 has a positive terminal 21 and a negative terminal 22, with the positive terminal 21 connected to the positive tab of the core pack and the negative terminal 22 connected to the negative tab of the core pack.

[0043] The cover assembly 20 is also provided with an injection hole 234, which is used to inject electrolyte into the cavity of the housing 10. After the electrolyte injection is completed, the injection hole 234 is sealed by the sealing structure 26 to prevent electrolyte in the cavity of the housing 10 from leaking out of the injection hole 234.

[0044] Figure 2 This is a cross-sectional view of one embodiment of the cover assembly provided in this application, wherein the connector of the sealing structure is welded to the cover. Figure 1 and Figure 2As shown, the cover assembly 20 may include a cover 23, which is connected to the housing 30 and encloses a cavity. Figure 2 The space located below the cover 23. The positive electrode post 21 passes through the cover 23 and connects to the positive tab of the core package inside the cavity. The positive electrode post 21 and the cover 23 are insulated from each other by an insulating element and remain sealed. The negative electrode post 22 passes through the cover 23 and connects to the negative tab of the core package inside the cavity. The negative electrode post 22 and the cover 23 are insulated from each other by an insulating element and remain sealed. The injection port 234 is located between the positive electrode post 21 and the negative electrode post 22 and penetrates the cover 23.

[0045] Figure 3 for Figure 2 A magnified view of point A in the middle. (See image below.) Figure 3 As shown, the cover plate assembly 20 may include a cover 23 and a sealing structure 26. The cover 23 has an injection hole 234. The sealing structure 26 includes a connector 25 and a seal 24 that are connected to each other. The connector 25 is connected to the cover 23, and the seal 24 is inserted into the injection hole 234 to seal the injection hole 234.

[0046] The cap 23 includes a top side 231 and a bottom side 232 distributed along a first direction Z. The top side 231 of the cap 23 has a mounting groove 233, and the bottom surface 2333 of the mounting groove 233 has a through injection hole 234. The connector 25 of the sealing structure 26 is at least partially installed within the mounting groove 233 and connected to the cap 23. The sealing element 24 of the sealing structure 26 is inserted into the injection hole 234 to seal it.

[0047] The first direction Z can be the thickness direction of the cap 23. The cavity formed by the cap 23 and the housing 30 is located on one side of the cap 23 along the first direction Z. The injection hole 234 penetrates the cap 23 along the first direction Z and communicates with the cavity formed by the cap 23 and the housing 30, so as to inject electrolyte into the cavity through the injection hole 234.

[0048] In some embodiments, such as Figures 3 to 5 As shown, the sealing structure 26 can include a connector 25 and a seal 24. The connector 25 is used to connect to the cover 23 of the battery 1. The connector 25 has a connecting groove 251 on one side along the first direction Z, and the area of ​​the connecting groove 251 in the cross section perpendicular to the first direction Z gradually decreases along the first direction Z. The seal 24 is located on the side of the connector 25 along the first direction Z. The seal 24 includes a connecting portion 241 that is inserted into the connecting groove 251 and adapted to the shape of the connecting groove 251. The seal 24 also includes a sealing portion 242 that is connected to the connecting portion 241. The sealing portion 242 is used to insert into the liquid injection hole 234 of the cover 23 to seal the liquid injection hole 234.

[0049] In this embodiment of the application, a connecting groove 251 is formed on one side of the connector 25 of the sealing structure 26 along the first direction Z, and the area of ​​the connecting groove 251 in the cross section perpendicular to the first direction Z gradually decreases along the first direction Z. At the same time, the sealing member 24 of the sealing structure 26 is located on one side of the connector 25 along the first direction Z, and the connecting part 241 of the sealing member 24 is inserted into the connecting groove 251 of the connector 25, and the shape of the connecting part 241 is adapted to the connecting groove 251. This can reduce the risk of the connecting part 241 of the sealing member 24 coming out of the connecting groove 251 and improve the connection stability between the connector 25 and the sealing member 24.

[0050] When using the sealing structure 26 to seal the liquid injection hole 234 of the cover 23, the connector 25 of the sealing structure 26 can be installed in the mounting groove 233 and connected to the cover 23 of the battery 1, so that the sealing member 24 is inserted into the liquid injection hole 234 of the cover 23 to seal the liquid injection hole 234. The process of sealing the liquid injection hole 234 is relatively simple, which can improve the assembly efficiency of the battery 1, and the structure of the sealing structure 26 is relatively simple.

[0051] In this configuration, the sealing part 242 can be inserted into the injection hole 234 of the cap 23, and the sealing part 242 and the injection hole 234 can be press-fitted together to effectively seal the injection hole 234. Alternatively, after the sealing part 242 is inserted into the injection hole 234 of the cap 23, the sealing part 242 and the injection hole 234 can be sealed with sealant.

[0052] In some embodiments, the inner circumferential surface of the connecting groove 251 can be tapered, and the inner diameter of the connecting groove 251 gradually decreases along the first direction Z. Therefore, after the inner circumferential surface of the connecting groove 251 abuts against the outer circumferential surface of the connecting portion 241 of the seal 24, the connecting portion 241 of the seal 24 can be effectively limited, preventing the connecting portion 241 of the seal 24 from dislodging from the connecting groove 251.

[0053] Of course, the inner circumferential surface of the connecting groove 251 can also be a convex or concave curved surface, as long as the area of ​​the cross section of the connecting groove 251 perpendicular to the first direction Z gradually decreases along the first direction Z. In addition, the cross section of the connecting groove 251 perpendicular to the first direction Z can be circular, round, rectangular, etc., as long as the inner circumferential surface of the connecting groove 251 can effectively abut against the outer circumferential surface of the connecting portion 241 of the seal 24, and prevent the connecting portion 241 of the seal 24 from dislodging from the connecting groove 251.

[0054] Figure 4 This is a schematic diagram of one embodiment of the sealing structure provided in this application. Figure 5 for Figure 4 A cross-sectional view along the AA direction. (See example...) Figure 4 and Figure 5As shown, the connector 25 has a first side surface 254 along the second direction Q, which is opposite to the first direction Z. The distance between the first side surface 254 and the bottom surface 255 of the connecting groove 251 is B1. The connector 25 has a second side surface 256 along the first direction Z, and the distance between the first side surface 254 and the second side surface 256 is B2. In some embodiments, the distance B1 between the first side surface 254 of the connector 25 and the bottom surface 255 of the connecting groove 251 and the distance B2 between the first side surface 254 and the second side surface 256 of the connector 25 can satisfy: 0.5 ≤ B1 / B2 ≤ 0.75. Therefore, the connector 25 can have high strength while the inner circumferential surface of the connecting groove 251 can stably limit the sealing portion 242 of the seal 24, resulting in high connection stability between the connector 25 and the seal 24.

[0055] The ratio of the distance B1 between the first side 254 of the connector 25 and the bottom surface 255 of the connecting groove 251 to the distance B2 between the first side 254 and the second side 256 of the connector 25 can be 0.52, 0.55, 0.58, 0.6, 0.63, 0.65, etc., depending on the shape and size of the sealing structure 26.

[0056] In some embodiments, the distance B1 between the first side surface 254 of the connector 25 and the bottom surface 255 of the connecting groove 251 can satisfy: 0.2mm ≤ B1 ≤ 0.6mm. This ensures that the connector 25 has high strength at the connecting groove 251, while also improving the connection stability between the connector 25 and the seal 24. The distance B1 between the first side surface 254 of the connector 25 and the bottom surface 255 of the connecting groove 251 can be 0.22mm, 0.25mm, 0.3mm, 0.35mm, 0.38mm, 0.4mm, 0.43mm, 0.55mm, etc., and can be determined according to the shape and size of the connector 25, without limitation here.

[0057] In addition, the distance B2 between the first side 254 and the second side 256 of the connector 25 can be made to satisfy: 0.6mm ≤ B2 ≤ 1mm, so that the connector 25 has high strength, thereby improving the connection stability between the connector 25 and the cover 23. The distance B2 between the first side 254 and the second side 256 of the connector 25 can be 0.62mm, 0.65mm, 0.7mm, 0.75mm, 0.78mm, 0.8mm, 0.83mm, 0.85mm, 0.9mm, etc., and can be determined according to the shape and size of the connector 25, which is not limited here.

[0058] It should be noted that the distance B1 between the first side surface 254 of the connector 25 and the bottom surface 255 of the connecting groove 251, and the distance B2 between the first side surface 254 and the second side surface 256 of the connector 25 can satisfy the above-mentioned proportional relationship and be within their respective numerical ranges. Alternatively, one of the following three factors can satisfy the above requirements: the range of the distance B1 between the first side surface 254 of the connector 25 and the bottom surface 255 of the connecting groove 251, the range of the distance B2 between the first side surface 254 and the second side surface 256 of the connector 25, and the proportional relationship between the distance B1 between the first side surface 254 of the connector 25 and the bottom surface 255 of the connecting groove 251, and the distance B2 between the first side surface 254 and the second side surface 256 of the connector 25. Of course, the former can further improve the connection stability between the connector 25 and the cover 23, while also improving the connection stability between the connector 25 and the seal 24.

[0059] like Figure 5 As shown, the total length of the sealing structure 26 in the first direction Z is B3. The total length B3 of the sealing structure 26 in the first direction Z and the distance B2 between the first side surface 254 and the second side surface 256 of the connector 25 can satisfy: 3 ≤ B3 / B2 ≤ 6. This ensures that the sealing portion 242 of the sealant 24 has sufficient length in the first direction Z, resulting in a better sealing effect on the injection hole 234. Simultaneously, it prevents the sealing portion 242 from being too long in the first direction Z and compressing the battery pack 1.

[0060] The ratio of the total length B3 of the sealing structure 26 in the first direction Z to the distance B2 between the first side 254 and the second side 256 of the connector 25 can be 3.2, 3.4, 3.5, 3.8, 4, 4.4, 4.7, 5, 5.3, 5.5, 3.8, etc., and can be determined according to the shape, size and other factors of the sealing structure 26.

[0061] It should be noted that the total length B3 of the sealing structure 26 in the first direction Z is the maximum length of the sealing structure 26 in the first direction Z. The total length B3 of the sealing structure 26 in the first direction Z is the sum of the distance B2 between the first side 254 and the second side 256 of the connector 25, and the maximum thickness of the portion of the sealing member 24 protruding from the surface of the connector 25 along the first direction Z in the first direction Z.

[0062] Specifically, the surface of the connecting portion 241 of the seal 24 along the first direction Z is flush with the surface of the second side 256 of the connector 25 along the first direction Z. The total length B3 of the sealing structure 26 in the first direction Z is the sum of the distance B2 between the first side 254 and the second side 256 of the connector 25 and the thickness of the sealing portion 242 in the first direction Z.

[0063] In some embodiments, the total length B3 of the sealing structure 26 in the first direction Z can satisfy: 2mm ≤ B3 ≤ 5mm, so that the sealing portion 242 of the sealant 24 has sufficient length in the first direction Z, resulting in a better sealing effect on the injection hole 234. Simultaneously, it can also prevent the sealing portion 242 from being too long in the first direction Z and compressing the battery pack 1. The total length B2 of the sealing structure 26 in the first direction Z can be 0.22mm, 0.25mm, 0.3mm, 0.35mm, 0.38mm, 0.4mm, 0.43mm, 0.45mm, 0.48mm, etc.

[0064] It should be noted that the total length B3 of the sealing structure 26 in the first direction Z can simultaneously satisfy: 3≤B3 / B2≤6, and 2mm≤B3≤5mm. Alternatively, the total length B3 of the sealing structure 26 in the first direction Z can also satisfy one of these conditions. Of course, the former can further improve the sealing effect of the sealing element 24 on the injection hole 234.

[0065] like Figure 5 As shown, the outer diameter of the sealing portion 242 of the seal 24 is A1, wherein the outer diameter A1 of the sealing portion 242 of the seal 24 can satisfy: 2mm≤A1≤6mm. Therefore, the sealing portion 242 of the seal 24 has a sufficient outer diameter to ensure a stable interference fit with the injection hole 234, effectively sealing the injection hole 234. Simultaneously, the seal 24 can be smoothly inserted into the injection hole 234.

[0066] The outer diameter A1 of the sealing part 242 of the seal 24 can be 2.5mm, 3mm, 3.3mm, 3.5mm, 3.8mm, 4mm, 4.5mm, 5mm, 5.4mm, 5.8mm, etc., depending on the structure of the seal 24.

[0067] It should be noted that when the sealing portion 242 of the seal 24 has a circular cross-sectional shape perpendicular to the first direction Z, the outer diameter A1 of the sealing portion 242 is the diameter of the sealing portion 242. When the sealing portion 242 of the seal 24 has a non-circular cross-sectional shape perpendicular to the first direction Z, the outer diameter A1 of the sealing portion 242 is the circumcircle diameter of the cross-section of the sealing portion 242 perpendicular to the first direction Z.

[0068] like Figure 5As shown, the connector 25 has a second side surface 256 on one side along the first direction Z, and the outer diameter of the second side surface 256 is A2. The outer diameter A2 of the second side surface 256 along the first direction Z can satisfy: 4.5mm ≤ A2 ≤ 9.5mm. This allows the connector 25 to have a larger size, facilitating welding the connector 25 to the cover 23. The outer diameter A2 of the second side surface 256 along the first direction Z can be 5mm, 6.5mm, 7mm, 8mm, etc., and is not limited here.

[0069] It should be noted that when the second side surface 256 of the connector 25 along the first direction Z is a circular surface, the outer diameter A2 of the second side surface 256 along the first direction Z is the diameter of the second side surface 256. When the second side surface 256 of the connector 25 along the first direction Z is a non-circular surface, the outer diameter A2 of the second side surface 256 along the first direction Z is the diameter of the circumcircle of the second side surface 256.

[0070] like Figure 5 As shown, the connector 25 has a first side surface 254 on one side along the second direction Q, where the second direction Q is opposite to the first direction Z. The outer diameter of the first side surface 254 is A3, which can satisfy the following condition: 5mm ≤ A3 ≤ 10mm. This allows the first side surface 254 of the connector 25 to have a larger diameter, which is beneficial for improving the connection strength between the connector 25 and the cover 23. The outer diameter A3 of the first side surface 254 of the connector 25 can be 6mm, 6.5mm, 7mm, 8mm / 9mm, etc., and is not limited here.

[0071] It should be noted that when the first side surface 254 of the connector 25 is a circular surface, the outer diameter A3 of the first side surface 254 is the diameter of the first side surface 254. When the first side surface 254 of the connector 25 is not a circular surface, the outer diameter A3 of the first side surface 254 is the diameter of the circumcircle of the first side surface 254.

[0072] In some embodiments, the outer diameter A2 of the second side 256 of the connector 25 and the outer diameter A3 of the first side 254 can satisfy: A3 > A2, that is, the diameter of the second side 256 of the connector 25 is greater than the diameter of the first side 254 of the connector 25, thereby giving the connector 25 a certain foolproof effect.

[0073] Specifically, the outer circumferential surface of the connector 25 can be tapered, and the outer diameter of the connector 25 gradually decreases along the first direction Z. This allows the connector 25 to have a certain degree of error prevention while also making processing easier.

[0074] Alternatively, A2 can be greater than A1, so that while the connector 25 abuts against the bottom surface 2333 of the mounting groove 233 on one side along the first direction Z, the sealing part 242 of the seal 24 can be stably inserted into the injection hole 234 and seal the injection hole 234.

[0075] In some embodiments, the minimum distance from the edge of the connector 25 along the Z-side of the first direction to the sealing portion 242 is A4, wherein 1.5 ≤ A4 ≤ 6 mm, so that the sealing portion 242 of the sealing member 24 has a good sealing effect on the injection hole 234, while the connector 25 can stably abut against the bottom surface 2333 of the mounting groove 233. The minimum distance A4 from the edge of the connector 25 along the Z-side of the first direction to the sealing portion 242 can be 2 mm, 2.2 mm, 2.5 mm, 3 mm, 3.4 mm, 3.7 mm, 4 mm, 5 mm, etc.

[0076] It should be noted that the outer diameter A1 of the sealing part 242 of the seal 24, the outer diameter A2 of the second side 256 of the connector 25, the outer diameter A3 of the first side 254 of the connector 25, and the minimum distance A4 from the edge of the connector 25 along the first direction Z side to the sealing part 242 can all meet the above requirements, or one or more of these parameters can meet the above requirements.

[0077] In some embodiments, the surface of the connecting portion 241 of the seal 24 along the first direction Z can be flush with the second side surface 256 of the connector 25 along the first direction Z, or the seal 24 can extend beyond the second side surface 256 of the connector 25 along the first direction Z. When the connector 25 of the sealing structure 26 is installed in the mounting groove 233 and the seal 24 is inserted into the injection hole 234, the surface of the connecting portion 241 of the seal 24 along the first direction Z can contact the bottom surface 2333 of the mounting groove 233, thereby improving the sealing effect of the seal 24 on the injection hole 234.

[0078] In some embodiments, the sealing portion 242 of the seal 24 can be accommodated within the injection hole 234 of the cap 23 to prevent the sealing portion 242 of the seal 24 from passing through the injection hole 234 of the cap 23 and extending out of the surface of the cap 23 toward the cavity side, thereby squeezing the core package inside the cavity.

[0079] Alternatively, the sealing portion 242 of the sealant 24 can be located in the injection hole 234 at one end away from the connector 25, or the sealing portion 242 of the sealant 24 can be flush with the opening edge of the injection hole 234 near the cavity, so that the sealing portion 242 of the sealant 24 is accommodated in the injection hole 234 of the cap 23.

[0080] The embodiments of this application also provide a cover plate assembly, which includes a sealing structure. The specific structure of the sealing structure is as described in the above embodiments. Since this cover plate assembly adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0081] The cover assembly 20 may include a cover 23 and a sealing structure 26. The cover 23 includes a top side 231 and a bottom side 232 distributed along the first direction Z. The top side 231 of the cover 23 has a mounting groove 233, and the bottom surface 2333 of the mounting groove 233 has a through-hole injection hole 234. The sealing structure 26 can refer to the above embodiments, and will not be described again here. The connector 25 of the sealing structure 26 is used to connect with the cover 23 of the battery 1 and is installed in the mounting groove 233. The sealing part 242 of the seal 24 is used to insert into the injection hole 234 of the cover 23 to seal the injection hole 234.

[0082] Figure 6 This is a partial structural diagram of one embodiment of the cover plate assembly provided in this application, wherein the connector of the sealing structure is not welded to the cover. Figure 6 As shown, the assembly gap N1 between the outer peripheral surface of the connector 25 and the inner peripheral surface of the mounting groove 233 is such that N1 satisfies the following condition: 0.05mm ≤ N1 ≤ 0.1mm. This allows for easier installation of the connector 25 into the mounting groove 233, while the mounting groove 233 accurately positions the connector 25, facilitating welding between the connector 25 and the cover 23.

[0083] The assembly gap N1 between the outer peripheral surface of the connector 25 and the inner peripheral surface of the mounting groove 233 can be 0.06mm, 0.07mm, 0.08mm, 0.09mm, etc., depending on the size and shape of the connector 25 and the cover 23.

[0084] Specifically, the inner circumferential surface of the mounting groove 233 is tapered. The outer circumferential surface of the connector 25 is tapered. The taper of the inner circumferential surface of the mounting groove 233 is equal to the taper of the outer circumferential surface of the connector 25.

[0085] like Figure 6As shown, the connector 25 abuts against the bottom surface 2333 of the mounting groove 233 on one side along the first direction Z. The distance between the first side 254 and the second side 256 of the connector 25 is B2, and the depth of the mounting groove 233 is H1. The distance B2 between the first side 254 and the second side 256 of the connector 25 and the depth H1 of the mounting groove 233 can satisfy: H1 ≥ B2. Therefore, the connector 25 can be completely contained within the mounting groove 233, preventing the connector 25 from protruding from the top side 231 surface of the cover 23 and reducing the risk of damage to the connector 25 after impact.

[0086] The difference between the distance B2 between the first side 254 and the second side 256 of the connector 25 and the depth H1 of the mounting groove 233 is M1, where M1 = H1 - B2. The difference M1 between the distance B2 between the first side 254 and the second side 256 of the connector 25 and the depth H1 of the mounting groove 233 can be made to satisfy: 0.05mm ≤ M1 ≤ 0.3mm.

[0087] This prevents the connector 25 from protruding from the top side 231 surface of the cover 23 while maximizing the thickness of the connector 25, thereby increasing the strength of the connector 25.

[0088] The difference M1 between the distance B2 between the first side 254 and the second side 256 of the connector 25 and the depth H1 of the mounting groove 233 can be 0.06mm, 0.1mm, 0.12mm, 0.17mm, 0.2mm, 0.25mm, 0.27mm, etc., depending on the size and shape of the connector 25 and the cover 23.

[0089] In some embodiments, the edge of the connector 25 is welded to the edge of the mounting groove 233 to improve the connection strength between the connector 25 and the cap 23. Specifically, the first direction Z is substantially aligned with the thickness direction of the cap 23. A weld 253 is formed between the edge of the connector 25 and the edge of the mounting groove 233 to weld the connector 25 to the cap 23. The weld 253 extends circumferentially along the mounting groove 233 in a ring structure to further improve the welding strength between the connector 25 and the cap 23, and the weld 253 can keep the edge of the connector 25 and the edge of the mounting groove 233 sealed, which is beneficial to further improve the sealing effect on the injection hole 234.

[0090] This application also provides a battery, which includes a cover assembly. The specific structure of the cover assembly is as described in the above embodiments. Since this battery adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0091] Among them, such as Figure 1As shown, battery 1 includes a casing 10 and a core pack (not shown in the figure). The casing 10 includes a cover assembly 20 and a housing 30, which are connected and enclose a cavity (not shown in the figure), within which the core pack is disposed. The structure of the cover assembly 20 can refer to the above embodiments and will not be repeated here. The structure of the core pack can be an existing structure including a core, a positive electrode tab, and a negative electrode tab, and is not limited here.

[0092] The embodiments of this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A sealing structure, characterized in that, include: A connector for connecting to a battery cover, the connector having a connecting groove on one side along a first direction, the area of ​​the connecting groove in a cross section perpendicular to the first direction gradually decreasing along the first direction; A sealing element is located on one side of the connector along the first direction. The sealing element includes a connecting portion that is inserted into the connecting groove and adapted to the shape of the connecting groove. The sealing element also includes a sealing portion connected to the connecting portion. The sealing portion is used to insert into the injection hole of the cap to seal the injection hole.

2. The sealing structure as described in claim 1, characterized in that, The inner circumferential surface of the connecting groove is a tapered surface, and the inner diameter of the connecting groove gradually decreases along the first direction.

3. The sealing structure as described in claim 1, characterized in that, The connector has a first side surface on one side along the second direction, which is opposite to the first direction; the distance between the first side surface and the bottom surface of the connecting groove is B1; the connector has a second side surface on one side along the first direction, and the distance between the first side surface and the second side surface is B2. Where, 0.5 ≤ B1 / B2 ≤ 0.75; and / or, Wherein, 0.2mm≤B1≤0.6mm; 0.6mm≤B2≤1mm.

4. The sealing structure as described in claim 1, characterized in that, The total length of the sealing structure in the first direction is B3; Where 3 ≤ B3 / B2 ≤ 6; and / or, Where 2mm≤B3≤5mm.

5. The sealing structure according to any one of claims 1 to 4, characterized in that, The outer diameter of the sealing part is A1, where 2mm≤A1≤6mm.

6. The sealing structure according to any one of claims 1 to 4, characterized in that, The connector has a second side surface on one side along the first direction, and the outer diameter of the second side surface is A2, wherein 4.5mm≤A2≤9.5mm.

7. The sealing structure according to any one of claims 1 to 4, characterized in that, The connector has a first side surface along a second direction, which is opposite to the first direction; the outer diameter of the first side surface is A3, wherein 5mm≤A3≤10mm.

8. The sealing structure according to any one of claims 1 to 4, characterized in that, The minimum distance from the edge of the connector on one side along the first direction to the sealing part is A4, where 1.5≤A4≤6mm.

9. The sealing structure according to any one of claims 1 to 4, characterized in that, The outer peripheral surface of the connector is a tapered surface, and the outer diameter of the connector gradually decreases along the first direction.

10. A cover plate assembly, characterized in that, include: The cap includes a top side and a bottom side distributed along a first direction, the top side of the cap having an installation groove, and the bottom surface of the installation groove having a through injection hole; A sealing structure, wherein the sealing structure is the sealing structure according to any one of claims 1 to 9, wherein the connector of the sealing structure is installed in the mounting groove, and the sealing element of the sealing structure is inserted into the injection hole to seal the injection hole.

11. The cover plate assembly as claimed in claim 10, characterized in that, The assembly gap between the outer peripheral surface of the connector and the inner peripheral surface of the mounting groove is N1, wherein 0.05mm≤N1≤0.1mm.

12. The cover plate assembly as claimed in claim 10, characterized in that, The connector abuts against the bottom surface of the mounting groove on one side along the first direction; the distance between the first side and the second side of the connector is B2, and the depth of the mounting groove is H1, wherein H1≥B2.

13. The cover plate assembly as claimed in claim 12, characterized in that, The difference between the distance B2 between the first and second sides of the connector and the depth H1 of the mounting groove is M1, where 0.05mm≤M1≤0.3mm.

14. The cover plate assembly as claimed in any one of claims 10 to 13, characterized in that, The edge of the connector is welded to the edge of the mounting groove.

15. A battery, characterized in that, Includes the cover plate assembly as described in any one of claims 10 to 14.

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