Top cover, battery and electric device

Abstract

The application provides a top cover, a battery and an electric device. A recess is arranged on the side of the cover plate facing the battery cell. The pole includes a pole body and a flange. The pole body is arranged in the mounting hole. The flange is connected to the periphery of the pole body and is arranged on the side of the cover plate facing the battery cell. An insulating component is arranged between the cover plate and the flange. The insulating component is partially arranged in the recess and protrudes away from the flange. The connection between the insulating component and the recess can prolong the creepage distance between the electrode terminal and the top cover plate, improve the insulation effect of the top cover, solve the problem of easy short circuit in the battery, and reduce the risk of battery damage and defects.

Description

Technical Field

[0001] This application relates to the field of battery technology, specifically to a top cover, a battery, and an electrical device. Background Technology

[0002] Batteries are commonly used in the new energy field as the driving force for vehicles, offering advantages such as high energy, high capacity, and high power. However, in related technologies, the insulation between the battery terminals and the top cover is often poor. When the battery is under high voltage, both terminals can be broken down by current, easily leading to short circuits and affecting the battery's safety performance. Utility Model Content

[0003] Embodiments of this application provide a top cover, a battery, and an electrical device that can improve the technical problem of poor insulation performance of the top cover.

[0004] In a first aspect, embodiments of this application provide a top cover for connecting a battery cell, the top cover comprising:

[0005] A cover plate, the cover plate having an installation opening and a groove on the side of the cover plate facing the battery cell;

[0006] A terminal post for connecting to the battery cell, the terminal post including a post body and a flange, the post body passing through the mounting port, the flange being connected to the outer peripheral surface of the post body and located on the side of the cover plate facing the battery cell;

[0007] An insulating component, at least partially disposed between the cover plate and the flange, and arranged around the pole post, wherein the portion of the insulating component located between the cover plate and the flange has a protruding portion, which is embedded in the groove.

[0008] In some embodiments, the insulating component includes:

[0009] A sealing element, the sealing element being disposed around the pole post, the protrusion including a first protrusion disposed on the sealing element;

[0010] The lower insulating member is disposed between the cover plate and the flange and abuts against the end of the sealing member away from the column body. The protrusion includes a second protrusion disposed on the lower insulating member.

[0011] The second protrusion surrounds the outer periphery of the first protrusion.

[0012] In some embodiments, the seal further includes a first body, the first protrusion being connected to the end of the first body away from the column and protruding from the side of the first body opposite to the flange;

[0013] The lower insulating member further includes a second body, wherein the first protrusion is connected to one end of the first body near the column and protrudes from the side of the second body opposite to the flange.

[0014] In some embodiments, the first protrusion abuts against the second protrusion, and the first body abuts against the second body.

[0015] In some embodiments, the cover plate includes a groove peripheral surface and a groove bottom surface forming the groove, the groove peripheral surface surrounding the groove bottom surface, and the distance from the groove bottom surface to the flange is H1;

[0016] The cover plate includes a bottom surface facing the lower insulator, and the height of the bottom surface of the cover plate from the lower insulator is H2;

[0017] Wherein, the ratio of H1 to H2 is greater than 1 and less than or equal to 2.

[0018] In some embodiments, the flange includes a bottom wall and an end wall, the bottom wall facing the cell, the end wall surrounding the bottom wall, and the lower insulator including a side wall abutting against the seal.

[0019] Along the radial direction of the pole post, the distance X1 from the sidewall to the endwall is greater than 0.1 mm.

[0020] In some embodiments, the cover plate includes a main body and an extension, the extension protruding from the inner peripheral surface of the main body, and the inner peripheral surface of the extension forming the mounting opening;

[0021] The groove is formed in the extension, and a first receiving groove is formed between the side of the extension away from the flange and the inner peripheral surface of the main body.

[0022] The top cover also includes an upper insulating member, which is at least partially disposed within the first receiving groove.

[0023] Along the thickness direction of the cover plate, the groove depth is H3, the extension thickness is H4, and the ratio of H3 to H4 is greater than 0.01 and less than or equal to 0.5.

[0024] In some embodiments, the upper insulating member includes a first segment, a second segment, and a third segment connected in sequence;

[0025] The second segment is installed in the first receiving groove, the first segment is connected to the end of the second segment away from the column body, and protrudes in a direction away from the flange. The first segment and the second segment form the second receiving groove. The top cover also includes a terminal pressing block, which is disposed in the second receiving groove and surrounds the column body.

[0026] The third segment is connected to the end of the second segment facing the column, extends toward the flange, and abuts against the seal.

[0027] This application embodiment also provides a battery, which includes a top cover as described above, and the battery also includes a cell and a housing. The cell is disposed inside the housing, the housing has an opening, and the top cover is disposed on the opening and connected to the cell.

[0028] This application also provides an electrical device, which includes the battery as described above.

[0029] The beneficial effects of the embodiments of this application are as follows:

[0030] In an embodiment of this application, a groove is provided on the side of the cover plate facing the battery cell. The electrode post includes a column and a flange. The column passes through the mounting opening, and the flange is connected to the periphery of the column and located on the side of the cover plate facing the battery cell. An insulating component is disposed between the cover plate and the flange, with a portion of the insulating component protruding away from the flange and embedded in the groove. The connection between the insulating component and the groove extends the creepage distance between the electrode terminals and the top cover, improves the insulation effect of the top cover, solves the problem of easy short circuits inside the battery, and reduces the risk of battery damage and defects. 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 This is a top view of the top cover provided in an embodiment of this application;

[0033] Figure 2 This is a schematic cross-sectional view of the top cover along AA provided in an embodiment of this application;

[0034] Figure 3 yes Figure 2 A magnified schematic diagram A1 of part A of the top cover shown;

[0035] Figure 4 yes Figure 2 A2 is an enlarged schematic diagram of part A of the top cover shown;

[0036] Figure 5 yes Figure 2 A3 is an enlarged schematic diagram of part A of the top cover shown.

[0037] Figure 6 yes Figure 2A4 shows an enlarged schematic diagram of the uncompressed portion A of the top cover.

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

[0039] 100. Top cover;

[0040] 10. Cover plate; 101. Groove; 11. Main body; 12. Extension; 120. First receiving groove;

[0041] 20. Pole; 21. Flange; 211. End wall; 212. Terminal pressing block;

[0042] 30. Insulating component; 301. Protrusion; 31. Seal; 311. First body; 312. First protrusion; 32. Lower insulating component; 321. Second body; 322. Second protrusion; 323. Sidewall;

[0043] 40. Upper insulating component; 41. First section; 42. Second section; 43. Third section; 430. Second receiving groove;

[0044] S1 Compression section; S2 Filling area. Detailed Implementation

[0045] 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.

[0046] Creepage distance refers to the surface distance between two conductive parts in an electrical device; it is the shortest path that current must travel along the device's surface. In related technologies, the creepage distance between the battery terminals 20 and the top cover 100 is too small, resulting in poor insulation. When the battery is in a high-voltage environment, both terminals may be damaged by current, easily leading to short circuits and affecting the battery's safety performance.

[0047] Please refer to Figures 1-3 , Figure 1 This is a top view of the top cover provided in an embodiment of this application. Figure 2 This is a schematic cross-sectional view of the top cover along AA provided in an embodiment of this application. Figure 3yes Figure 2 A1 shows an enlarged schematic diagram of a portion A of the top cover. This application provides a top cover 100 for connecting a battery cell. The top cover 100 includes a cover plate 10 and a terminal post 20. The cover plate 10 has an installation opening and a groove 101 on the side of the cover plate 10 facing the battery cell. The terminal post 20 is used to connect to the battery cell and includes a column and a flange 21. The column passes through the installation opening, and the flange 21 is connected to the outer peripheral surface of the column and located on the side of the cover plate 10 facing the battery cell. The top cover 100 also includes an insulating component 30. The insulating component 30 is at least partially disposed between the cover plate 10 and the flange 21 and is arranged around the terminal post 20. The portion of the insulating component 30 located between the cover plate 10 and the flange 21 has a protrusion 301, which is embedded in the groove 101.

[0048] Specifically, the cover 10 provides physical protection for the inside of the battery, preventing external impacts, scratches, dust, and other foreign substances from entering the battery and thus protecting it from damage. The flange 21 can be a terminal flange, which is a key component connecting the battery's internal circuitry to the external circuitry, ensuring stable current transmission. The terminal flange also provides mechanical support, ensuring the structural stability of the battery or device.

[0049] Compared to related technologies, the insulating component 30 in this application is embedded in the groove 101 of the cover plate 10. At this time, the entire insulating component 30 and the cover plate 10 are in close contact, so that the insulation creepage path is extended. The longer creepage distance helps the device withstand higher voltages, making the current flow path on the surface more complex, avoiding accidents caused by high voltage breakdown, reducing the risk of battery damage and malfunction, thereby improving user safety.

[0050] Furthermore, the fit between the protrusion and the groove 101 forms a mortise and tenon structure, which ensures a very tight connection between different structural components. This tightness prevents the joint from loosening or shifting, thus maintaining the stability of the joint under impact and reducing damage caused by loosening or cracking. This interlocking connection not only enhances the stability of the structure but also limits the relative positional relationship between the components.

[0051] This design ensures that the positional relationship and sealing interface between the insulating component 30 and the cover plate 10 are not significantly affected by the deformation of the insulating component 30. This helps reduce the risk of discharge under high-voltage conditions, enhances the overall system safety and reliability, and effectively solves the problem of deteriorated insulation and sealing performance or even failure caused by deformation of the insulating component 30.

[0052] In some embodiments, the top cover 100 includes a seal 31 and a lower insulator 32. The seal 31 is disposed around the pole post 20, and the protrusion 301 includes a first protrusion 312 disposed on the seal 31. The lower insulator 32 is disposed between the cover plate 10 and the flange 21 and abuts against the end of the seal 31 opposite to the pole post. The protrusion 301 includes a second protrusion 322 disposed on the lower insulator 32, and the second protrusion 322 surrounds the outer periphery of the first protrusion 312.

[0053] Specifically, the groove 101 includes a first space and a second space that are interconnected. The first protrusion 312 extends away from the flange 21 and is embedded in the first space. The second protrusion 322 extends away from the flange 21 and is embedded in the second space.

[0054] Understandably, the lower insulator 32 provides necessary structural support for the battery, ensuring that the battery casing does not deform under stress. The lower insulator 32 also has good electrical insulation properties, effectively isolating the battery cell from the cover plate 10 and preventing electrical faults. The seal 31 prevents leakage of electrolytes and other substances, which could corrode the cover plate 10 through gaps and cause a short circuit in the battery. Simultaneously, the seal 31 also acts as an insulator for the cover plate 10, thereby improving the insulation performance between the cover plate 10 and the battery cell, and enhancing the reliability of the battery.

[0055] In some embodiments, the seal 31 further includes a first body 311, and a first protrusion 312 is connected to the end of the first body 311 away from the post and protrudes from the side of the first body 311 opposite to the flange 21. The lower insulator 32 further includes a second body 321, and the first protrusion 312 is connected to the end of the first body 311 near the post and protrudes from the side of the second body 321 opposite to the flange 21.

[0056] In some embodiments, the first protrusion 312 abuts against the second protrusion 322, and the first body 311 abuts against the second body 321. The mutual abutment between the seal 31 and the lower insulator 32 can improve the structural sealing performance, prevent external environmental damage to the internal components of the battery, and thus increase battery safety.

[0057] Please refer to Figures 4-5 , Figure 4 yes Figure 2 A2 is an enlarged schematic diagram of part A of the top cover shown. Figure 5 yes Figure 2 A3 shows an enlarged schematic diagram of a portion A of the top cover. In some embodiments, the cover plate 10 includes a groove peripheral surface and a groove bottom surface forming a groove 101, the groove peripheral surface surrounds the groove bottom surface, the distance from the groove bottom surface to the flange 21 is H1, the cover plate 10 includes a cover plate 10 bottom surface facing the lower insulating member 32, the height from the cover plate 10 bottom surface to the lower insulating member 32 is H2, wherein the ratio of H1 to H2 is greater than 1 and less than or equal to 2.

[0058] Understandably, H1 represents the actual creepage distance of this scheme, while H2 represents the creepage distance under the traditional structure. By increasing the thickness of the insulating material, the distance between conductive structures increases, thereby reducing the probability of electrical faults.

[0059] The ratio of H1 to H2 can be 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.8mm, 1.9mm, etc., and this application does not limit it.

[0060] In some embodiments, the flange 21 includes a bottom wall and an end wall 211, the bottom wall facing the cell and the end wall 211 surrounding the bottom wall, and the lower insulator 32 includes a side wall 323 abutting against the seal 31, the distance from the side wall 323 to the end wall 211 being greater than 0.1 mm along the radial direction of the pole post 20.

[0061] Understandably, if the distance between the side wall 323 and the end wall 211 is greater than 0.1 mm, the lower insulating member 32 can be sandwiched between the flange 21 and the cover plate 10, increasing the stability of the connection between the lower insulating member 32 and the flange 21. If the distance is shorter, the connection between the lower insulation and the cover plate 10 may be poor, leading to leakage.

[0062] The distance X1 between the side wall 323 and the end wall 211 can be 0.15mm, 0.2mm, 0.25mm, 0.3mm, 0.35mm, etc., and is not limited in this application.

[0063] In some embodiments, the cover plate 10 includes a main body 11 and an extension 12. The extension 12 protrudes from the inner peripheral surface of the main body 11, and the inner peripheral surface of the extension 12 forms a mounting opening. A groove 101 is formed in the extension 12. A first receiving groove 120 is formed between the side of the extension 12 away from the flange 21 and the inner peripheral surface of the main body 11. The top cover 100 also includes an upper insulating member 40, which is at least partially disposed in the first receiving groove 120. Along the thickness direction of the cover plate 10, the depth of the groove 101 is H3, and the thickness of the extension 12 is H4. The ratio of H3 to H4 is greater than 0.01 and less than or equal to 0.5.

[0064] Understandably, if the groove 101 is too deep, it may weaken the structural strength of the cover plate 10, making the cover plate 10 easy to break or deform, and may even affect the sealing effect of the cover plate 10, leading to leakage of liquid inside the battery.

[0065] The ratio of H3 to H4 can be 0.02mm, 0.05mm, 0.1mm, 0.15mm, 0.2mm, 0.25mm, 0.3mm, 0.35mm, 0.04mm, 0.45mm, 0.5mm, etc., and this application does not limit it.

[0066] In some embodiments, the upper insulating member 40 includes a first segment 41, a second segment 42, and a third segment 43 connected in sequence. The second segment 42 is installed in the first receiving groove 120. The first segment 41 is connected to the end of the second segment 42 away from the column and protrudes in a direction away from the flange 21. The first segment 41 and the second segment 42 form a second receiving groove 430. The top cover 100 also includes a terminal pressing block 212. The terminal pressing block 212 is disposed in the second receiving groove 430 and surrounds the column. The third segment 43 is connected to the end of the second segment 42 facing the column and extends in a direction towards the flange 21, and abuts against the sealing member 31.

[0067] Figure 6 yes Figure 2 The enlarged schematic diagram A4 shows a portion A of the top cover that is not compressed. In some embodiments, the sealing member 31 includes a main body 11 and a compression part S1. The main body 11 is mounted on the side of the flange 21 away from the battery cell. The compression part S1 is connected to the side of the main body 11 away from the flange 21. After the lower insulating member 32 is mounted in the groove 101, a filling area S2 is formed between the sealing member 31 and the lower insulating member 32. When the compression part S1 is squeezed by the cover plate 10 and the third section 43, the compression part S1 deforms and fills the filling area S2. The volume of the compression part S1 is larger than the volume of the filling area S2.

[0068] Specifically, to ensure good sealing, if the top cover 100 is circumferential, meaning the cross-sections in all directions are the same, the size of the compression section and the filling area can be visually determined by the area. In this case, the cross-sectional area of ​​the compression section is greater than that of the filling area. If the top cover 100 assembly is not circumferential, meaning the cross-sections in all directions are different, then the volumes of the two need to be compared. In this case, the volume of the compression section is greater than that of the filling area.

[0069] Understandably, since the sealing ring has elastic deformation capability, pressing the sealing ring onto the flange 21 can, on the one hand, make the installation of the terminal post 20 on the cover plate 10 more stable, and on the other hand, the compressed sealing ring has a better sealing effect on the terminal post 20 and the cover plate 10, thereby enhancing the sealing performance of the battery top cover 100, improving the battery's safety performance, and increasing the battery's service life.

[0070] This application also provides a battery, which includes a top cover 100 as described above, and the battery also includes a cell and a housing. The cell is disposed inside the housing, the housing has an opening, and the top cover 100 is disposed on the opening and connected to the cell.

[0071] The battery can be a primary battery, a secondary battery, or a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, etc. The battery cell can be cylindrical, flat, cuboid, or other shapes, etc., and this application does not limit it.

[0072] The battery also includes cells, a casing, and connecting plates. The cells are housed inside the casing, which has an opening. A top cover 100 covers the opening, and terminals 20 are connected to the connecting plates. Thus, after the top cover 100 seals the battery casing, the battery is connected to an external circuit via the terminals 20, enabling the conduction of battery current.

[0073] This application also provides an electrical device, which includes the battery as described above, and the battery is used to provide electrical energy to the electrical device. The electrical device can be an electric vehicle, power tool, electric bicycle, energy storage system, drone, mobile device, etc. By incorporating a battery, the safety of the electrical device can be ensured and its service life can be improved.

[0074] 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 top cover for connecting a battery cell, characterized in that, The top cover includes: A cover plate, the cover plate having an installation opening and a groove on the side of the cover plate facing the battery cell; A terminal post, used for connecting to the battery cell, the terminal post includes a post body and a flange, the post body passes through the mounting port, and the flange is connected to the outer peripheral surface of the post body; An insulating component, at least partially disposed between the cover plate and the flange, and arranged around the pole post, wherein the portion of the insulating component located between the cover plate and the flange has a protruding portion, which is embedded in the groove.

2. The top cover according to claim 1, characterized in that, The insulating component includes: A sealing element, the sealing element being disposed around the pole post, the protrusion including a first protrusion disposed on the sealing element; The lower insulating member is disposed between the cover plate and the flange and abuts against the end of the sealing member away from the column body. The protrusion includes a second protrusion disposed on the lower insulating member. The second protrusion surrounds the outer periphery of the first protrusion.

3. The top cover according to claim 2, characterized in that, The sealing element further includes a first body, wherein the first protrusion is connected to the end of the first body away from the column and protrudes from the side of the first body opposite to the flange; The lower insulating member further includes a second body, wherein the first protrusion is connected to one end of the first body near the column and protrudes from the side of the second body opposite to the flange.

4. The top cover according to claim 3, characterized in that, The first protrusion abuts against the second protrusion, and the first body abuts against the second body.

5. The top cover according to any one of claims 2-4, characterized in that, The cover plate includes a groove peripheral surface and a groove bottom surface forming the groove, the groove peripheral surface surrounds the groove bottom surface, and the distance from the groove bottom surface to the flange is H1; The cover plate includes a bottom surface facing the lower insulator, and the height of the bottom surface of the cover plate from the lower insulator is H2; Wherein, the ratio of H1 to H2 is greater than 1 and less than or equal to 2.

6. The top cover according to any one of claims 2-4, characterized in that, The flange includes a bottom wall and an end wall, the bottom wall facing the battery cell, the end wall surrounding the bottom wall, and the lower insulating member including a side wall abutting against the sealing member; Along the radial direction of the pole post, the distance X1 from the sidewall to the endwall is greater than 0.1 mm.

7. The top cover according to any one of claims 2-4, characterized in that, The cover plate includes a main body and an extension, the extension protruding from the inner peripheral surface of the main body, and the inner peripheral surface of the extension forming the mounting opening; The groove is formed in the extension, and a first receiving groove is formed between the side of the extension away from the flange and the inner peripheral surface of the main body. The top cover also includes an upper insulating member, which is at least partially disposed within the first receiving groove; Along the thickness direction of the cover plate, the groove depth is H3, the extension thickness is H4, and the ratio of the groove depth H3 to the extension thickness H4 is greater than 0.01 and less than or equal to 0.

5.

8. The top cover according to claim 7, characterized in that, The upper insulating component comprises a first segment, a second segment, and a third segment connected in sequence; The second segment is installed in the first receiving groove, the first segment is connected to the end of the second segment away from the column body, and protrudes in a direction away from the flange. The first segment and the second segment form the second receiving groove. The top cover also includes a terminal pressing block, which is disposed in the second receiving groove and surrounds the column body. The third segment is connected to the end of the second segment facing the column, extends toward the flange, and abuts against the seal.

9. A battery, characterized in that, The battery includes a top cover as described in any one of claims 1-8, and further includes a battery cell and a housing, the battery cell being disposed within the housing, the housing having an opening, and the top cover being disposed over the opening and connected to the battery cell.

10. An electrical appliance, characterized in that, Includes the battery as described in claim 9.

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