Sealing structure, shell assembly, cover plate assembly, single battery cell and battery pack

Abstract

The invention provides a sealing structure, a shell assembly, a cover plate assembly, a single battery cell and a battery pack. The sealing structure comprises a main body piece, a pole assembly, a first insulating piece, a second insulating piece and a sealing piece, the main body piece is provided with a mounting hole. And the pole assembly is arranged in the mounting hole. The first insulating part is arranged on the first side of the main body part, and the first insulating part abuts against the pole assembly. The second insulating part is arranged on the second side of the main body part and abuts against the pole assembly. The sealing piece comprises a first sealing part, a second sealing part and a third sealing part which are integrally formed. The first sealing part is positioned in an axial gap between the main body piece and the pole assembly; and the second sealing part is positioned in a radial gap between the main body piece and the pole assembly. The third sealing part is located between the main body piece and the second insulating piece. Therefore, the number of used sealing elements can be reduced, the sealing cost is reduced, the assembling steps of the sealing elements are simplified, and the production efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of battery technology, specifically to a sealing structure, a housing assembly, a cover plate assembly, a single battery cell, and a battery pack. Background Technology

[0002] In related technologies, the casing or cover assembly of a single battery cell typically includes an upper plastic part, a lower plastic part, an inner seal, and an outer seal. The inner and outer seals work together to achieve good insulation. However, this double-layer sealing structure results in higher costs for a single battery cell and involves numerous riveting processes. Summary of the Invention

[0003] The embodiments of the present invention provide a sealing structure, a housing assembly, a cover plate assembly, a single battery cell, and a battery pack, which simplify the sealing structure and reduce sealing costs.

[0004] In a first aspect, embodiments of the present invention provide a sealing structure, comprising: The main component has mounting holes. The pole assembly is disposed within the mounting hole; A first insulating member is disposed on a first side of the main body member, and the first insulating member abuts against the pole assembly; A second insulating member is disposed on the second side of the main body member, and the second insulating member abuts against the pole assembly; The sealing element includes an integrally formed first sealing portion, a second sealing portion, and a third sealing portion, wherein the first sealing portion is located between the axial gap between the main body and the pole assembly, the second sealing portion is located between the radial gap between the main body and the pole assembly, and the third sealing portion is located between the main body and the second insulating member.

[0005] This reduces the number of seals used, lowers sealing costs, simplifies seal assembly steps, and improves production efficiency.

[0006] In one embodiment, the first sealing portion includes a first sealing section pressed between the body member and the first insulating member, and a second sealing section pressed between the body member and the axial gap of the pole assembly. Along the radial direction of the first sealing portion, one end of the first sealing section is connected to the second sealing section, and the other end of the first sealing section abuts against the first insulating member.

[0007] Thus, the sealing effect of the first sealing part is achieved through the coordinated cooperation of the first sealing section and the second sealing section. The outer peripheral surface of the first sealing section abuts against the first insulating member, so that the first insulating member can not only compress the first sealing section to play a sealing role, but also limit the circumferential movement of the first sealing section.

[0008] In one embodiment, the height of the first sealing section is less than the height of the second sealing section.

[0009] Therefore, the first sealing section of the first sealing part can mainly play an insulating role, and the second sealing section of the first sealing part can mainly play a sealing role, so that the first sealing part can achieve both sealing and insulation.

[0010] In one embodiment, the compression ratio of the first sealing segment is A11, which satisfies: 5% ≤ A11 ≤ 25%.

[0011] This ensures that the first sealing part can perform its sealing and insulating functions, and prevents the first insulating part from being crushed, which would cause a decrease in insulation performance or loss of insulation effect.

[0012] In one embodiment, the compression ratio of the second sealing section (512) is A12, which satisfies: 15%≤A12≤70%.

[0013] This ensures that the first sealing part can perform its sealing and insulating functions, and prevents the first insulating part from being crushed, which would cause a decrease in insulation performance or loss of insulation effect.

[0014] In one embodiment, the third sealing portion is pressed between the main body and the second insulating member. Along the radial direction of the third sealing portion, one end of the third sealing portion abuts against the pole assembly, and the other end of the third sealing portion abuts against the second insulating member. The compression ratio of the third sealing portion is A3, which satisfies: 15%≤A3≤65%.

[0015] This ensures that the third sealing part can play a sealing role and prevents the second insulating part from being squeezed and cracked, which would cause a decrease in insulation performance or loss of insulation effect.

[0016] In one embodiment, the thickness of the third sealing portion is D1, which satisfies: 0.1 mm ≤ D1 ≤ 1.0 mm.

[0017] This ensures that the third sealing part has good sealing performance and prevents it from crushing the second insulating part.

[0018] In one embodiment, the length of the third sealing part is L1, which satisfies: 0.1 mm ≤ L1 ≤ 1.5 mm.

[0019] This ensures that the third sealing part has good sealing performance and prevents it from crushing the second insulating part.

[0020] In one embodiment, the seal has a first state and a second state. In the first state, the second sealing portion and the third sealing portion are an integral segment and are angled relative to the first sealing portion. In the second state, the end of the integral segment away from the first sealing portion is compressed to form the second sealing portion and the third sealing portion. The seal is configured to switch from the first state to the second state after being compressed by the main body, the pole assembly, the first insulating member, and the second insulating member.

[0021] Therefore, by compressing and deforming the seal, the sealing effect of the seal is ensured.

[0022] In one embodiment, in the first state, the seal has a stepped stage that protrudes radially outward, the area between the bottom surface of the stepped stage and the top surface of the seal defining the sealing height of the seal, wherein the thickness of the stepped stage is D2 and the sealing height is H1, satisfying: 0.2≤D2 / H1≤0.75.

[0023] Therefore, on the one hand, it prevents the stage from being too thin, which would cause the stage to break due to insufficient strength, and on the other hand, it prevents the stage from being too thick, which would cause the first insulating component to be squeezed and cracked.

[0024] In one embodiment, in the first state, the thickness of the seal is D3 and the thickness of the main body is D4, satisfying: 1.2≤(D3-H1) / D4≤2.0.

[0025] This ensures that the seal can cover the area to be sealed in the mounting hole after being compressed, and avoids excessive interference between the seal and the first insulator, which could cause the first insulator to be compressed and cracked.

[0026] In one embodiment, the first insulating member has a first reinforcing rib on the side away from the main body member, and the first reinforcing rib abuts against the pole assembly along the axial direction of the sealing structure.

[0027] Therefore, the structure of the first insulating component is strengthened, thereby improving the structural strength of the first insulating component.

[0028] In one embodiment, the thickness of the first reinforcing rib is D5, which satisfies: 0.03 mm ≤ D5 ≤ 0.1 mm.

[0029] This ensures the effectiveness of the first reinforcing rib in strengthening the structure of the first insulating component and prevents excessive compression of the seal due to excessive total thickness of the first reinforcing rib and the first insulating component.

[0030] In one embodiment, the first reinforcing ribs are spaced at least two apart along the circumferential direction of the first insulating member.

[0031] This ensures the effectiveness of the first reinforcing rib in strengthening the structure of the first insulating component.

[0032] In one embodiment, the adjacent angle between any two adjacent first reinforcing ribs is B1, satisfying: 20°≤B1≤120°.

[0033] This ensures the structural reinforcement effect of the first reinforcing rib on the first insulating component and prevents the overall weight from becoming too large due to an excessive number of first reinforcing ribs.

[0034] In one embodiment, the first insulating member has a drainage groove on its periphery facing the main body member.

[0035] Therefore, the cleaning water that flows between the first insulating component and the main body component during the washing process can be discharged from the drain trough to prevent cleaning water from remaining on the first insulating component.

[0036] In one embodiment, the drainage grooves are spaced at least two apart along the circumference of the first insulating member.

[0037] This ensures that the cleaning water is fully drained, preventing cleaning water residue from remaining on the first insulating component.

[0038] In one embodiment, the width of the drainage groove is positively correlated with the dimension of the first insulating member extending along the width direction of the drainage groove.

[0039] Therefore, for different models of the first insulating component, the drainage groove has sufficient width to ensure that no cleaning water remains in the drainage groove.

[0040] In one embodiment, the width of the drainage groove is F1, the diameter of the first insulating member is D6, and the central angle corresponding to the drainage groove is B2, satisfying: F1=π*D6*B2 / 360.

[0041] This ensures that the drainage trough has good drainage performance and that no cleaning water remains.

[0042] In one embodiment, the width of the drainage channel is F1, which satisfies: 1 mm ≤ F1 ≤ 15 mm.

[0043] This ensures that the drainage trough has good drainage performance and that no cleaning water remains.

[0044] In one embodiment, the depth of the drainage groove is defined radially along the first insulating member, the depth of the drainage groove is H2, and the dimension of the first insulating member extending along the width direction of the drainage groove is D6, satisfying: 0.02≤H2 / D6≤0.1.

[0045] This ensures that the drainage channel has sufficient depth to facilitate the removal of dirt located near the inside between the first insulator and the housing or cover, and also ensures that the first insulator has sufficient strength.

[0046] In one embodiment, the height of the drainage groove is defined along the axial direction of the first insulating member, the height of the drainage groove is H3, and the thickness of the first insulating member is D7, satisfying: 0.05≤H3 / D7≤0.4.

[0047] This ensures that the drainage trough has sufficient height to allow cleaning water to enter and rinse the area between the first insulator and the housing or cover, and that the cleaned water can be discharged from the drainage trough, while also ensuring that the first insulator has sufficient strength.

[0048] In one embodiment, the second insulating member includes an insulating section and a crimping section connected to the inner periphery of the insulating section, wherein the crimping section is crimped to the third sealing portion.

[0049] Therefore, the sealing element is pressed by the pressing section, so that the sealing element is deformed to form a third sealing part.

[0050] In one embodiment, the thickness of the insulating section is D8 and the thickness of the crimping section is D9, satisfying: 0.15≤D9 / D8≤0.65.

[0051] This ensures that the second insulating component has sufficient strength to prevent it from breaking due to external forces, and avoids excessive interference between the seal and the second insulating component, which could cause the first insulating component to be squeezed and broken.

[0052] In one embodiment, the insulating segment includes an insulator segment and a protruding sub-segment connected to the outer periphery of the insulator segment, wherein the crimping segment is connected to the inner periphery of the insulator segment, the protruding sub-segment protrudes in a direction away from the main body, and the protruding sub-segment is connected to the pressure ring of the pole assembly.

[0053] This achieves a fixed connection between the second insulating element and the pressure ring.

[0054] In one embodiment, the second insulating member is constructed with a first support portion and a second support portion protruding outward along its axial direction. The first support portion and the second support portion both extend circumferentially along the second insulating member. The first support portion and the second support portion are arranged radially spaced along the second insulating member and define a drain groove. The second support portion is located at the outer periphery of the second insulating member and has a drain port formed on it.

[0055] This prevents the electrolyte from coming into contact with the main component, thus avoiding corrosion of the main component.

[0056] In one embodiment, the drain outlet is a notch formed on the outer periphery of the second support portion, or the drain outlet is an opening formed at the bottom of the second support portion.

[0057] Therefore, the electrolyte can be discharged at the location of the second support.

[0058] In one embodiment, the drain outlet forms a notch wall on the second support portion, wherein the notch wall is an inclined surface and tilts away from the axis of the insulating component along the direction from the main body to the insulating component; or, the notch wall is an arc-shaped surface and bulges outward away from the axis of the insulating component along the direction from the main body to the insulating component.

[0059] This facilitates the flow of electrolyte and can prevent electrolyte from flowing back from the drain port to a certain extent.

[0060] In one embodiment, the notch is a rectangular notch, and the opening of the notch faces away from the central region of the insulating element.

[0061] This allows the electrolyte to be discharged.

[0062] In one embodiment, the second insulating member is further provided with a second reinforcing rib protruding outward along its axial direction, wherein the second reinforcing rib extends radially along the second insulating member.

[0063] This prevents the second insulating component from bending and deforming.

[0064] In one embodiment, the reinforcing ribs are arranged in at least two circumferential directions of the insulating member, and the first support portion, the second support portion, and every two adjacent second reinforcing ribs together define a drainage groove on the insulating member.

[0065] This can further improve the structural strength of the insulating components, and eliminate the need for grooving on the insulating components, thus simplifying the manufacturing process and improving production efficiency.

[0066] In one embodiment, the protrusion height of the second reinforcing rib, the protrusion height of the first support portion, and the protrusion height of the second support portion are the same.

[0067] Therefore, keeping the top surface of the insulating component flush is beneficial for manufacturing and also aesthetically pleasing.

[0068] In one embodiment, the depth of the drain trough is H4, and the thickness of the second insulating member is D10, satisfying: 0.05≤H4 / D10≤0.3.

[0069] This avoids corrosion caused by contact between the electrolyte and the casing or cover plate, and also prevents deformation due to insufficient strength of the second insulating component.

[0070] In one embodiment, the width of the drain port is F2, which satisfies: 1 mm ≤ F2 ≤ 8 mm.

[0071] This ensures that the drain port can drain the electrolyte from the drain tank. Simultaneously, the drain port also serves as a positioning structure for the riveting of the second insulating component; an excessively wide drain port will lead to increased positioning deviation of the second insulating component rivets.

[0072] In one embodiment, the second insulating member has a clearance groove on the side facing away from the main body member, the clearance groove being configured as an expansion region of the electrode assembly.

[0073] Therefore, an expansion area can be reserved for the electrode assembly to prevent the electrode assembly from being squeezed after expansion.

[0074] Secondly, embodiments of the present invention provide a housing assembly including the sealing structure as described above, wherein the main body is a housing.

[0075] This reduces the number of seals used, lowers sealing costs, simplifies seal assembly steps, and improves production efficiency.

[0076] Thirdly, embodiments of the present invention provide a cover plate assembly, including the sealing structure as described above, wherein the main body is a cover plate.

[0077] This reduces the number of seals used, lowers sealing costs, simplifies seal assembly steps, and improves production efficiency.

[0078] Fourthly, embodiments of the present invention provide a single battery cell, including the housing assembly as described above, or including the cover plate assembly as described above.

[0079] This reduces the number of seals used, lowers sealing costs, simplifies seal assembly steps, and improves production efficiency.

[0080] Fifthly, embodiments of the present invention provide a battery pack including the single battery cell as described above.

[0081] This reduces the number of seals used, lowers sealing costs, simplifies seal assembly steps, and improves production efficiency.

[0082] The beneficial effects of the embodiments of the present invention are as follows: In embodiments of the present invention, a first sealing portion is disposed between the axial gap between the main body and the pole assembly to achieve a sealed connection of the axial gap between the main body and the pole assembly; a second sealing portion is disposed between the radial gap between the main body and the pole assembly to achieve a sealed connection of the radial gap between the main body and the pole assembly; and a third sealing portion is disposed between the main body and the second insulating member to achieve a sealed connection between the main body and the second insulating member. Since the first, second, and third sealing portions are integrally formed into a single sealing element, structural sealing can be achieved with a single sealing element. This reduces the number of sealing elements used, lowers sealing costs, simplifies the assembly steps of the sealing elements, and improves production efficiency. Attached Figure Description

[0083] To more clearly illustrate the technical solutions in the embodiments of the present invention, 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 the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0084] Figure 1 This is one of the exploded views of a single battery cell provided in the embodiments of the present invention; Figure 2 yes Figure 1 A partial cross-sectional view of a single battery cell; Figure 3 This is the second exploded view of a single battery cell provided in an embodiment of the present invention; Figure 4 yes Figure 3 A partial cross-sectional view of a single battery cell; Figure 5 This is a cross-sectional view of the seal provided in an embodiment of the present invention in a first state; Figure 6 This is a cross-sectional view of the seal provided in an embodiment of the present invention in a second state; Figure 7 This is a schematic diagram of the structure of the first insulating member provided in an embodiment of the present invention; Figure 8 This is a cross-sectional view of the first insulating member provided in an embodiment of the present invention; Figure 9 This is a bottom view of the first insulating member provided in an embodiment of the present invention; Figure 10 This is a top view of the first insulating member provided in an embodiment of the present invention; Figure 11 This is one of the cross-sectional views of the second insulating member provided in the embodiments of the present invention; Figure 12 This is a schematic diagram of the structure of the second insulating member provided in an embodiment of the present invention; Figure 13 This is a second cross-sectional view of the second insulating member provided in an embodiment of the present invention.

[0085] Explanation of reference numerals in the attached figures: 1. Main body; 11. Mounting hole; 12. First side; 13. Second side; 2. Terminal assembly; 21. Terminal; 22. Pressure ring; 3. First insulating component; 31. First reinforcing rib; 32. Drainage channel; 4. Second insulating component; 41. Insulating section; 411. Insulator section; 412. Protruding section; 42. Crimping section; 43. Second reinforcing rib; 44. First support part; 45. Second support part; 46. Drainage trough; 47. Drainage port; 48. Clearance groove; 5. Seal; 51. First sealing part; 52. Second sealing part; 53. Third sealing part; 54. Stage. Detailed Implementation

[0086] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Furthermore, it should be understood that the specific embodiments described herein are only for illustration and explanation of the present invention and are not intended to limit the present invention. In the present invention, 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.

[0087] This application provides a battery pack. The battery pack includes a battery box and battery modules disposed within the battery box. The battery modules include multiple individual battery cells. The battery box provides a space for accommodating the individual battery cells, and the battery box can adopt various structures. In some embodiments, the battery box includes a casing and a top cover that overlap each other. The casing and the top cover together define an accommodating space for accommodating the individual battery cells. The casing can be a hollow structure, and the top cover can be a plate-like structure, with the top cover covering the opening side of the casing so that the top cover and the casing together define the accommodating space. Both the casing and the top cover can be hollow structures with an opening on one side, with the opening of the top cover covering the opening side of the casing. Of course, the battery box formed by the top cover and the casing can be of various shapes, such as a cylinder, a cuboid, etc.

[0088] In a battery pack, there can be multiple individual cells. These cells can be connected in series, parallel, or a combination thereof. A combination thereof means that multiple cells are connected in both series and parallel configurations. Multiple cells can be directly connected in series, parallel, or a combination thereof, and then the entire assembly of these cells is housed within a battery box. Alternatively, the battery pack can be composed of multiple individual cells first connected in series, parallel, or a combination thereof to form battery modules, and then these battery modules are connected in series, parallel, or a combination thereof to form a whole, which is then housed within a battery box. The battery pack may also include other structures; for example, it may include a busbar for electrical connection between the multiple individual cells.

[0089] Each individual cell can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited to these. Individual cells can be cylindrical, flat, cuboid, or other shapes.

[0090] like Figure 1 and Figure 3 As shown in the illustration, this application also provides a single battery cell. The single battery cell includes a housing, a cover assembly, and electrode assemblies and other functional components located within the housing.

[0091] This application also provides a single battery cell. The single battery cell includes a housing assembly and electrode assemblies and other functional components located within the housing assembly.

[0092] This application also provides a housing assembly. This housing assembly is applied to a single battery cell. The housing assembly has mounting holes 11 on its housing. A terminal assembly 2, a first insulator 3, a second insulator 4, and a sealing member 5 are connected to the housing. The first insulator 3 is disposed on a first side 12 of the main body 1 and abuts against the terminal assembly 2. The second insulator 4 is disposed on a second side 13 of the main body 1 and abuts against the terminal assembly 2. The sealing member 5 includes an integrally formed first sealing portion 51, a second sealing portion 52, and a third sealing portion 53. The first sealing portion 51 is located between the main body 1 and the first insulator 3. The second sealing portion 52 is located between the main body 1 and the terminal assembly 2. The third sealing portion 53 is located between the main body 1 and the second insulator 4.

[0093] In some embodiments, the housing includes a steel housing. Of course, the housing may also include other housings such as an aluminum housing; the material of the housing is not limited in the embodiments of this application.

[0094] This application also provides a cover plate assembly. This cover plate assembly is applied to a single battery cell. The cover plate of the cover plate assembly has mounting holes 11. A terminal post assembly 2, a first insulating member 3, a second insulating member 4, and a sealing member 5 are connected to the cover plate. The first insulating member 3 is disposed on a first side 12 of the main body 1 and abuts against the terminal post assembly 2. The second insulating member 4 is disposed on a second side 13 of the main body 1 and abuts against the terminal post assembly 2. The sealing member 5 includes an integrally formed first sealing portion 51, a second sealing portion 52, and a third sealing portion 53. The first sealing portion 51 is located between the main body 1 and the first insulating member 3. The second sealing portion 52 is located between the main body 1 and the terminal post assembly 2. The third sealing portion 53 is located between the main body 1 and the second insulating member 4.

[0095] like Figures 1 to 13 As shown in the figure, this application embodiment also provides a sealing structure. The sealing structure includes a main body 1, a pole assembly 2, a first insulating member 3, a second insulating member 4, and a sealing member 5. The main body 1 has a mounting hole 11. The pole assembly 2 is disposed within the mounting hole 11. The first insulating member 3 is disposed on a first side 12 of the main body 1 and abuts against the pole assembly 2. The second insulating member 4 is disposed on a second side 13 of the main body 1 and abuts against the pole assembly 2. The sealing member 5 includes an integrally formed first sealing portion 51, a second sealing portion 52, and a third sealing portion 53. The first sealing portion 51 is located between the axial gap between the main body 1 and the pole assembly 2. The second sealing portion 52 is located between the radial gap between the main body 1 and the pole assembly 2. The third sealing portion 53 is located between the main body 1 and the second insulating member 4.

[0096] In this embodiment, a first sealing part 51 is disposed between the main body 1 and the pole post assembly 2 to achieve a sealed connection of the axial gap between the main body 1 and the pole post assembly 2; a second sealing part 52 is disposed between the main body 1 and the pole post assembly 2 to achieve a sealed connection of the radial gap between the main body 1 and the pole post assembly 2; and a third sealing part 53 is disposed between the main body 1 and the second insulating part 4 to achieve a sealed connection of the axial gap between the main body 1 and the second insulating part 4. Since the first sealing part 51, the second sealing part 52, and the third sealing part 53 are integrally formed into a single sealing element 5, structural sealing can be achieved through a single sealing element 5. This reduces the number of sealing elements 5 used, lowers sealing costs, simplifies the assembly steps of the sealing element 5, and improves production efficiency.

[0097] It is understood that the terminal assembly 2 is disposed within the mounting hole 11 of the main body 1. Along the radial direction of the sealing structure, the terminal assembly 2 and the wall surface of the mounting hole 11 are spaced apart. This allows the second sealing portion 52 of the seal 5 to be located within the radial gap between the terminal assembly 2 and the main body 1, thereby sealing the area between the terminal assembly 2 and the wall surface of the mounting hole 11. The mounting hole 11 is typically a circular hole. Of course, the shape of the mounting hole 11 can be reasonably selected based on different individual cell design standards.

[0098] like Figure 1 As shown, in some embodiments, the pole assembly 2 includes a pole 21 and a pressure ring 22. The pressure ring 22 is sleeved on the outside of the pole 21. The pole 21 has a first abutment portion protruding radially outward. The first abutment portion is axially spaced from a first side 12 of the main body 1. A first insulating member 3 is disposed in the region between the first abutment portion and the first side 12 of the main body 1, and both ends of the first insulating member 3 abut against the first abutment portion and the main body 1, respectively. A portion of the first sealing portion 51 may be located between the first abutment portion and the main body 1, so that this portion of the first sealing portion 51 can be located within the axial gap between the pole assembly 2 and the main body 1. The pressure ring 22 has a second abutment portion protruding radially outward. The second abutment portion is axially spaced from a second side 13 of the main body 1. A second insulating member 4 is disposed in the region between the second abutment portion and the second side 13 of the main body 1, and both ends of the second insulating member 4 abut against the second abutment portion and the main body 1, respectively.

[0099] It should be noted that the first side 12 and the second side 13 of the main body 1 are opposite sides of the main body 1 along the axial direction. Specifically, the sealing structure is applied to a single battery cell. The single battery cell contains an electrode assembly. The first side 12 of the main body 1 is the side of the main body 1 away from the electrode assembly. The second side 13 of the main body 1 is the side of the main body 1 closer to the electrode assembly.

[0100] The sealing structure in this embodiment is particularly suitable for cylindrical batteries. The main body 1 can be a cover plate in a cover plate assembly. The cover plate is separately connected to the housing. Alternatively, the main body 1 can be the housing in a housing assembly.

[0101] like Figure 2 and Figure 4As shown, in some embodiments, the first insulating element 3 is an upper plastic part. The first insulating element 3 can be made of materials such as PFA (Perfluoroalkoxy Alkane), PP (Polypropylene), PPS (Polyphenylene Sulfide), PBT (Polybutylene Terephthalate), and FKM (Fluoroelastomer).

[0102] In some embodiments, the second insulating element 4 is a lower plastic part. The second insulating element 4 may also be made of materials such as PFA, PP, PPS, PBT, and FKM.

[0103] In some embodiments, the seal 5 is configured as a sealing ring. The seal 5 may be made of materials such as FKM, EPDM (Ethylene Propylene Diene Monomer), PFA, and PBT.

[0104] In some embodiments, the first sealing portion 51 includes a first sealing segment 511 pressed between the main body 1 and the first insulating member 3, and a second sealing segment 512 pressed between the main body 1 and the axial gap of the pole assembly 2. Along the radial direction of the first sealing portion 51, one end of the first sealing segment 511 is connected to the second sealing segment 512, and the other end of the first sealing segment 511 abuts against the first insulating member 3.

[0105] It is understandable that the sealing effect of the first sealing part 51 is achieved by the cooperation of the first sealing section 511 and the second sealing section 512. The outer peripheral surface of the first sealing section 511 abuts against the first insulating member 3, so that the first insulating member 3 can not only compress the first sealing section 511 to play a sealing role, but also limit the circumferential movement of the first sealing section 511.

[0106] Based on the structure of the seal 5 being integrally formed, the first sealing section 511 and the second sealing section 512 are integrally formed.

[0107] In some embodiments, the height of the first sealing section 511 is less than the height of the second sealing section 512.

[0108] It is understandable that the height of the first sealing section 511 is less than the height of the second sealing section 512 so that the first sealing part 51 can be disposed between the main body 1 and the pole assembly 2 and compressed to achieve the effect of insulation and sealing.

[0109] The bottom surfaces of the first sealing section 511 and the second sealing section 512 are flush, and the top surface of the first sealing section 511 is lower than the top surface of the second sealing section 512, so that the first sealing section 511 and the second sealing section 512 form a roughly stepped structure.

[0110] In some embodiments, the compression ratio of the first sealing segment 511 is A11, which satisfies: 5% ≤ A11 ≤ 25%.

[0111] Understandably, the first sealing section 511 is in a compressed state between the main body 1 and the first insulating member 3, thereby ensuring that the first sealing section 51 can perform its sealing and insulating functions. The compression rate of the first sealing section 511 is set in the range of 5% to 25% to ensure sealing and insulating performance and to prevent the first insulating member 3 from being crushed, which would cause a decrease in insulation performance or loss of insulation effect.

[0112] A 3000-volt DC high voltage is applied to the first sealing section 511 at different compression rates over a period of 10 seconds to test the insulation performance of the first sealing section 51. Specifically, when the compression rate of the first sealing section 511 is 3%, both the room temperature and high temperature insulation performance of the sealing structure is in a state of failure. When the compression rate of the first sealing section 511 is 20%, both the room temperature and high temperature insulation performance of the sealing structure is in a state of effectiveness. When the compression rate of the first sealing section 511 is 35%, the first insulating element 3 will be crushed, causing both the room temperature and high temperature insulation performance of the sealing structure to fail.

[0113] It should be noted that "high temperature" in high-temperature insulation performance refers to a temperature exceeding 85 degrees Celsius. Based on the compression ratio setting of the first sealing section 511, the sealing structure possesses excellent high-temperature insulation performance, reducing the possibility of high-temperature insulation failure.

[0114] The sealing performance of the first sealing section 511 at different compression ratios was tested using a helium detector. When the compression ratio of the first sealing section 511 was 3%, the sealing performance of the first sealing part 51 was poor, and it was in a state of sealing failure. When the compression ratio of the first sealing section 511 was 20%, the first sealing part 51 had a good sealing effect.

[0115] In some embodiments, the compression ratio of the first sealing segment 511 is set to 5%, 10%, 15%, 20%, 25%, or any value between any two.

[0116] In some embodiments, the compression ratio of the second sealing section 512 is A12, satisfying: 15% ≤ A12 ≤ 70%.

[0117] Understandably, the second sealing section 512 is in a compressed state between the main body 1 and the pole assembly 2, thereby ensuring that the first sealing part 51 can perform its sealing and insulating functions. The compression rate of the second sealing section 512 is set in the range of 15% to 70% to ensure sealing and insulating performance and to prevent the first insulating part 3 from being crushed, which would cause a decrease in insulation performance or loss of insulation effect.

[0118] In some embodiments, the compression ratio of the second sealing section 512 is set to 15%, 30%, 45%, 60%, 70%, or any value between any two.

[0119] In some embodiments, the second sealing portion 52 is pressed between the radial gap between the body 1 and the pole assembly 2, thereby ensuring the sealing between the body 1 and the pole assembly 2.

[0120] In some embodiments, the third sealing portion 53 is pressed between the main body 1 and the second insulating member 4. Along the radial direction of the third sealing portion 53, one end of the third sealing portion 53 abuts against the pole assembly 2, and the other end of the third sealing portion 53 abuts against the second insulating member 4. The compression ratio of the third sealing portion 53 is A3, satisfying: 15% ≤ A3 ≤ 65%.

[0121] Understandably, the third sealing part 53 is compressed between the main body 1 and the second insulating part 4 to ensure that the second sealing part 52 can perform its sealing function. Furthermore, the second insulating part 4 can also limit the outer peripheral surface of the third sealing part 53. The compression rate of the second sealing part 52 is set in the range of 15% to 65% to ensure sealing performance and prevent the second insulating part 4 from being crushed, which would cause a decrease in insulation performance or loss of insulation effect.

[0122] A 3000-volt DC high voltage was applied to the third sealing part 53 at different compression rates over a period of 10 seconds to test its insulation performance. When the compression rate of the third sealing part 53 was 10%, both its room temperature and high temperature insulation performance were in a failed state. When the compression rate of the third sealing part 53 was 40%, both its room temperature and high temperature insulation performance were effective. When the compression rate of the third sealing part 53 was 70%, the second insulating element 4 was crushed, causing both its room temperature and high temperature insulation performance to fail.

[0123] The sealing performance of the third sealing part 53 with different compression ratios was tested using a helium detector. When the compression ratio of the third sealing part 53 was 10%, the sealing performance of the third sealing part 53 was poor, and it was in a state of sealing failure. When the compression ratio of the third sealing part 53 was 40%, the third sealing part 53 had a good sealing effect.

[0124] In some embodiments, the compression ratio of the third sealing portion 53 is set to 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, or any value between any two.

[0125] like Figure 2 As shown, in some embodiments, the thickness of the third sealing portion 53 is D1, which satisfies: 0.1 mm ≤ D1 ≤ 1.0 mm.

[0126] Understandably, setting the thickness of the third sealing part 53 to the range of 0.1 mm to 1.0 mm ensures the sealing thickness of the third sealing part 53, giving it good sealing performance, while preventing it from crushing the second insulating member 4.

[0127] When the thickness of the third sealing part 53 is set to 0.05 mm, the sealing thickness of the third sealing part 53 is too small, and the compression effect of the third sealing part 53 is not obvious, which may lead to sealing failure. At this time, the electrolyte can easily penetrate from the area of ​​the third sealing part 53 into the shell, causing corrosion of the shell. When the thickness of the third sealing part 53 is set to 0.8 mm, the third sealing part 53 has good sealing performance and can effectively prevent the electrolyte from penetrating into the shell and causing corrosion. When the thickness of the third sealing part 53 is set to 1.5 mm, the sealing thickness of the third sealing part 53 is too large, which may cause the second insulating member 4 to be crushed. At this time, the electrolyte can easily penetrate into the shell through the crack in the second insulating member 4, causing corrosion of the shell.

[0128] In some embodiments, the thickness of the third sealing portion 53 is set to 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1.0 mm, or any value between any two.

[0129] Please continue reading. Figure 2 In some embodiments, the length of the third sealing part 53 is L1, which satisfies: 0.1 mm ≤ L1 ≤ 1.5 mm.

[0130] Understandably, setting the length of the third sealing part 53 to the range of 0.1 mm to 1.5 mm ensures the sealing length of the third sealing part 53, giving it good sealing performance, while preventing it from crushing the second insulating part 4.

[0131] When the length of the third sealing part 53 is set to 0.05 mm, the sealing length is too short, and there is a possibility of sealing failure. In this case, electrolyte can easily penetrate from the area of ​​the third sealing part 53 into the housing, causing corrosion of the housing. When the length of the third sealing part 53 is set to 1.0 mm, the third sealing part 53 has good sealing performance and can effectively prevent electrolyte from penetrating into the housing and causing corrosion. When the length of the third sealing part 53 is set to 2.0 mm, the sealing length is too long, which may cause the second insulating member 4 to be crushed. In this case, electrolyte can easily penetrate into the housing at the crack in the second insulating member 4, causing corrosion of the housing.

[0132] In some embodiments, the length of the third sealing portion 53 is set to 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1.0 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, or any value between any two.

[0133] like Figure 5 and Figure 6 As shown, in some embodiments, the seal 5 has a first state and a second state. In the first state, the second sealing portion 52 and the third sealing portion 53 are an integral segment and are angled relative to the first sealing portion 51. In the second state, the end of the integral segment away from the first sealing portion 51 is compressed to form the second sealing portion 52 and the third sealing portion 53. The seal 5 is configured to switch from the first state to the second state after being compressed by the main body 1, the pole assembly 2, the first insulating member 3, and the second insulating member 4.

[0134] Understandably, before being compressed, the second sealing portion 52 and the third sealing portion 53 are a single integral segment, angled relative to the first sealing portion 51. At this time, the cross-section of the sealing member 5 is stepped. After being compressed by the main body 1, the pole assembly 2, the first insulating member 3, and the second insulating member 4, the end of the integral segment furthest from the first sealing portion 51 is compressed to form the second sealing portion 52 and the third sealing portion 53. At this time, the sealing member 5 is compressed into a C-shaped cross-section. Thus, by compressing and deforming the sealing member 5, the sealing effect of the sealing member 5 is ensured.

[0135] It should be noted that the seal 5 is annular. The cross-sectional shape referred to here is the shape of the seal 5 on one side of its axis of symmetry. For example, the cross-section of the seal 5 includes a left portion and a right portion located on either side of its axis of symmetry. Before compression, both the left and right portions of the seal 5 are stepped. After compression, both the left and right portions of the seal 5 become C-shaped.

[0136] The seal 5 has a stepped cross-section before being compressed, which has a stepped stage 54. This stepped stage 54 is compressed and deformed by the first insulating member 3, thereby ensuring high-temperature insulation through the compression deformation of the stepped stage 54.

[0137] like Figure 5 As shown, in some embodiments, in a first state, the seal 5 has a stepped platform 54 that protrudes radially outward. The area between the bottom surface of the stepped platform 54 and the top surface of the seal 5 defines the sealing height of the seal 5. The thickness of the stepped platform 54 is D2, and the sealing height is H1, satisfying: 0.2 ≤ D2 / H1 ≤ 0.75.

[0138] Understandably, during the transition of the seal 5 from the first state to the second state, the platform stage 54 will be deformed by the first insulating member 3. Setting the ratio of the thickness of the platform stage 54 to the sealing height within the range of 0.2 to 0.75 prevents the platform stage 54 from being too thin and breaking due to insufficient strength, while also preventing the platform stage 54 from being too thick and causing the first insulating member 3 to be crushed.

[0139] It should be noted that, to ensure a good seal, the sealing height must meet the design value. The ratio of the thickness of stage 54 to the sealing height typically depends on the thickness of stage 54.

[0140] When the ratio of the thickness of stage 54 to the sealing height is 0.1, the thickness of stage 54 is too small, and stage 54 is prone to breakage. When the ratio of the thickness of stage 54 to the sealing height is 0.5, stage 54, after being compressed and deformed, forms at least a portion of the first sealing part 51 and has a good sealing effect. When the ratio of the thickness of stage 54 to the sealing height is 2.0, the interference fit between stage 54 and the first insulating member 3 is too large, which will cause the first insulating member 3 to be compressed and cracked.

[0141] In some embodiments, the ratio of the thickness of the stage 54 to the sealing height is set to 0.2, 0.4, 0.6, 0.75, or any value between the two.

[0142] Please continue reading. Figure 5 In some embodiments, in the first state, the thickness of the seal 5 is D3 and the thickness of the main body 1 is D4, satisfying: 1.2≤(D3-H1) / D4≤2.0.

[0143] Understandably, setting the ratio of the difference between the thickness of the seal 5 and the thickness of the stage 54 to the thickness of the main body 1 within the range of 1.2 to 2.0 ensures, on the one hand, that the seal 5, after being compressed, can cover the area to be sealed in the mounting hole 11, preventing electrolyte from seeping into the housing and causing corrosion. On the other hand, it avoids excessive interference between the seal 5 and the first insulating component 3, which could cause the first insulating component 3 to be compressed and cracked.

[0144] It should be noted that, to ensure a good seal, the sealing height must meet the design value. The ratio of the difference between the thickness of the seal 5 and the thickness of the stage 54 to the thickness of the main body 1 usually depends on the difference between the thickness of the seal 5 and the thickness of the stage 54.

[0145] When the ratio of the difference between the thickness of the seal 5 and the thickness of the stage 54 to the thickness of the main body 1 is 1.0, the difference is too small, causing the seal 5 to fail to cover the area to be sealed in the mounting hole 11 after being compressed. The electrolyte inside will then seep from the seal 5 into the housing, causing corrosion. When the ratio is 1.5, the seal 5 has good sealing performance and can prevent electrolyte from seeping into the housing. When the ratio is 2.5, the interference fit between the seal 5 and the first insulating member 3 is too large, which can cause the first insulating member 3 to be crushed.

[0146] In some embodiments, the ratio of the difference between the thickness of the seal 5 and the thickness of the stage 54 to the thickness of the body 1 is set to 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, 2.0, or any value between the two.

[0147] like Figure 7 As shown, in some embodiments, the first insulating member 3 has a first reinforcing rib 31 on the side away from the main body member 1. Along the axial direction of the sealing structure, the first reinforcing rib 31 abuts against the pole assembly 2.

[0148] Understandably, the first reinforcing rib 31 can structurally strengthen the first insulating component 3, thereby improving its structural strength. Specifically, the pole 21 of the pole assembly 2 abuts against the first reinforcing rib 31, thereby using the pole 21 to compress the reinforcing rib and lock the radial position of the first insulating component 3. This prevents the sealing component 5 from radially compressing the first insulating component 3 and causing it to expand outwards. If the first insulating component 3 expands outwards, its outer diameter will exceed the design tolerance, affecting its overall dimensions and performance.

[0149] In some embodiments, the first reinforcing rib 31 is integrally formed on the first insulating member 3.

[0150] like Figure 8 As shown, in some embodiments, the thickness of the first reinforcing rib 31 is D5, which satisfies: 0.03 mm ≤ D5 ≤ 0.1 mm.

[0151] Understandably, the thickness of the first reinforcing rib 31 is set within the range of 0.03 mm to 0.1 mm to ensure the reinforcing effect of the first reinforcing rib 31 on the structure of the first insulating member 3, and to prevent the total thickness of the first reinforcing rib 31 and the first insulating member 3 from being too large, which would result in excessive compression of the sealing member 5.

[0152] When the thickness of the first reinforcing rib 31 is set to 0.02 mm, its reinforcing effect on the first insulating member 3 is not significant. When the sealing member 5 is compressed, it exerts a force on the first insulating member 3, causing it to expand radially and outwards. When the thickness of the first reinforcing rib 31 is set to 0.06 mm, it provides good structural reinforcement, preventing the first insulating member 3 from expanding outwards. When the thickness of the first reinforcing rib 31 is set to 0.15 mm, the first insulating member 3 and the first reinforcing rib 31 require more height space, increasing the compression of the sealing member 5. In this case, the compression of the sealing member 5 does not meet the design standards, posing a risk of leakage.

[0153] In some embodiments, the thickness of the first reinforcing rib 31 is set to 0.03 mm, 0.05 mm, 0.08 mm, 0.1 mm, or any value between any two.

[0154] like Figure 7 As shown, in some embodiments, the first reinforcing ribs 31 are spaced at least two apart along the circumferential direction of the first insulating member 3.

[0155] It is understandable that by providing at least two first reinforcing ribs 31 in the circumferential direction of the first insulating member 3, the first insulating member 3 can have good structural strength, ensuring the effect of the first reinforcing ribs 31 in strengthening the structure of the first insulating member 3.

[0156] In some embodiments, at least two first reinforcing ribs 31 are equidistantly spaced along the circumference of the first insulating member 3.

[0157] In some embodiments, at least two first reinforcing ribs 31 are arranged in a centrally symmetrical manner along the circumference of the first insulating member 3.

[0158] like Figure 10 As shown, in some embodiments, the adjacent angle between any two adjacent first reinforcing ribs 31 is B1, satisfying: 20°≤B1≤120°.

[0159] It is understandable that setting the adjacent angles of every two adjacent first reinforcing ribs 31 within the range of 20° to 120° can keep the number of first reinforcing ribs 31 within a suitable range. On the one hand, this ensures the structural reinforcement effect of the first reinforcing ribs 31 on the first insulating component 3, and on the other hand, it prevents the overall weight from becoming too large due to an excessive number of first reinforcing ribs 31.

[0160] When the angle between any two adjacent first reinforcing ribs 31 is 10°, the number of first reinforcing ribs 31 on the first insulating member 3 is excessive, resulting in an increase in the weight of the first insulating member 3, which is detrimental to the lightweight design of the single battery cell. When the angle between any two adjacent first reinforcing ribs 31 is 100°, the first insulating member 3 has sufficient structural strength and a suitable weight. When the angle between any two adjacent first reinforcing ribs 31 is 150°, the number of first reinforcing ribs 31 on the first insulating member 3 is insufficient, resulting in insufficient strength of the first insulating member 3, and the sealing member 5 can easily squeeze and deform the first insulating member 3, causing the first insulating member 3 to expand outward.

[0161] In some embodiments, the adjacent angles of every two adjacent first reinforcing ribs 31 are set to 20°, 40°, 60°, 80°, 100°, 120°, or any value between any two.

[0162] like Figure 7 As shown, in some embodiments, the periphery of the first insulating member 3 facing the main body member 1 is provided with a drainage groove 32.

[0163] Understandably, when a sealing structure is applied to a single battery cell, the single battery cell needs to be washed after assembly. The single battery cell is usually washed horizontally. By setting a drainage groove 32 on the periphery of the first insulating member 3 facing the main body 1, the cleaning water flowing between the first insulating member 3 and the main body 1 during the washing process can be discharged from the drainage groove 32 to prevent cleaning water from remaining on the first insulating member 3.

[0164] Please continue reading. Figure 7 In some embodiments, at least two drainage grooves 32 are spaced apart along the circumference of the first insulating member 3.

[0165] It is understandable that at least two drainage grooves 32 are provided along the circumference of the first insulating member 3 to ensure that the cleaning water is fully discharged and to prevent the cleaning water from remaining on the first insulating member 3.

[0166] In some embodiments, at least two drainage channels 32 are equidistantly spaced along the circumference of the first insulating member 3.

[0167] In some embodiments, at least two drainage channels 32 are arranged in a centrally symmetrical manner along the circumference of the first insulating member 3.

[0168] In some embodiments, the width of the drainage groove 32 is positively correlated with the dimension of the first insulating member 3 extending along the width direction of the drainage groove 32.

[0169] It is understandable that the width of the drainage groove 32 is positively correlated with the dimension of the first insulating member 3 extending along the width direction of the drainage groove 32, so that the width of the drainage groove 32 can be reasonably set for different models of the first insulating member 3, so that the drainage groove 32 has sufficient width to ensure that no cleaning water remains in the drainage groove 32.

[0170] In some embodiments, the first insulating member 3 is circular, and the drainage groove 32 is arranged radially along the first insulating member 3. In this case, the width of the drainage groove 32 is positively correlated with the diameter of the first insulating member 3, and / or, the width of the drainage groove 32 is positively correlated with the central angle corresponding to the first drainage groove 32.

[0171] Understandably, the larger the diameter of the first insulating component 3, the wider the drainage groove 32; conversely, the smaller the diameter of the first insulating component 3, the narrower the drainage groove 32. Similarly, the larger the central angle corresponding to the drainage groove 32, the wider the drainage groove 32; and the smaller the central angle corresponding to the drainage groove 32, the narrower the drainage groove 32. Therefore, for different models of the first insulating component 3, the drainage groove 32 has sufficient width to ensure that no cleaning water remains in the drainage groove 32.

[0172] In some embodiments, the first insulating member 3 is rectangular. The drainage channel 32 is arranged along the width direction of the first insulating member 3, so the width of the drainage channel 32 can be positively correlated with the width of the first insulating member 3. Alternatively, the drainage channel 32 is arranged along the length direction of the first insulating member 3, so the width of the drainage channel 32 is positively correlated with the length of the first insulating member 3.

[0173] like Figure 8 and Figure 9 As shown, in some embodiments, the width of the drainage groove 32 is F1, the diameter of the first insulating member 3 is D6, and the central angle corresponding to the drainage groove 32 is B2, satisfying: F1=π*D6*B2 / 360.

[0174] It is understandable that the width of the drainage groove 32 is functionally related to the diameter of the first insulating member 3 and the central angle corresponding to the drainage groove 32. Therefore, the width of the drainage groove 32 is calculated based on the diameter of the first insulating member 3 and the designed adjacent angle between each two adjacent drainage grooves 32, so as to facilitate the mold opening and ensure that the drainage groove 32 formed on the first insulating member 3 has good drainage performance and will not leave cleaning water.

[0175] In some embodiments, the drainage grooves 32 are arranged at intervals along the circumference of the first insulating member 3, and the central angle corresponding to the drainage grooves 32 can be set in the range of 1° to 15°. This ensures that the number of drainage grooves 32 is moderate, avoids excessive drainage grooves 32 from affecting the structural strength of the first insulating member 3, and ensures the drainage performance of the first insulating member 3.

[0176] When the central angle corresponding to the drainage groove 32 is set to 0.8°, the width of the drainage groove 32 is relatively small. To ensure drainage performance, a large number of drainage grooves 32 need to be opened in the circumferential direction of the first insulating member 3, which will reduce the structural strength of the first insulating member 3, making it easier for the first insulating member 3 to be crushed by the pole post 21 or squeezed by the seal 5. When the central angle corresponding to the drainage groove 32 is set to 10°, the first insulating member 3 has sufficient structural strength, and the drainage groove 32 can fully drain the cleaning water. When the central angle corresponding to the drainage groove 32 is set to 20°, the width of the drainage groove 32 is relatively large. To ensure the structural strength of the first insulating member 3, a smaller number of drainage grooves 32 need to be opened in the circumferential direction of the first insulating member 3, which will result in the cleaning water not being completely drained, causing cleaning water to remain between the first insulating member 3 and the shell or cover plate.

[0177] like Figure 9 As shown, in some embodiments, the width of the drainage groove 32 is F1, which satisfies: 1 mm ≤ F1 ≤ 15 mm.

[0178] Understandably, the width of the drain groove 32 is set in the range of 1 mm to 15 mm to ensure that the drain groove 32 has good drainage performance and avoids residual cleaning water between the first insulating member 3 and the housing or cover plate.

[0179] When the width of the drainage channel 32 is set to 0.8 mm, the surface tension of the water will cause the cleaning water to be adsorbed in the drainage channel 32, making it difficult for the cleaning water to drain. When the width of the drainage channel 32 is set to 10 mm, the first insulating member 3 has sufficient structural strength, and the drainage channel 32 can fully drain the cleaning water. When the width of the drainage channel 32 is set to 20 mm, the width of the drainage channel 32 is too large, resulting in an excessively large span of the drainage channel 32, which is prone to cracking.

[0180] In some embodiments, the width of the drainage channel 32 is set to 1 mm, 3 mm, 5 mm, 7 mm, 9 mm, 11 mm, 13 mm, 15 mm, or any value between the two.

[0181] Please continue reading. Figure 8 In some embodiments, the depth of the drainage groove 32 is defined radially along the first insulating member 3. The depth of the drainage groove 32 is H2, and the dimension of the first insulating member 3 extending along the width direction of the drainage groove 32 is D6, satisfying: 0.02≤H2 / D6≤0.1.

[0182] It is understood that the ratio of the depth of the drainage groove 32 to the dimension of the first insulating member 3 extending along the width direction of the drainage groove 32 is set in the range of 0.02 to 0.1, so that the drainage groove 32 has sufficient depth to facilitate the drainage of dirt located between the first insulating member 3 and the housing or cover plate near the inner side, and to ensure that the first insulating member 3 has sufficient strength.

[0183] When the ratio of the depth of the drainage channel 32 to the dimension of the first insulating member 3 extending along the width direction of the drainage channel 32 is set to 0.01, the depth of the drainage channel 32 is insufficient, and it cannot drain the dirt located near the inner side between the first insulating member 3 and the housing or cover. When the ratio of the depth of the drainage channel 32 to the dimension of the first insulating member 3 extending along the width direction of the drainage channel 32 is set to 0.08, the first insulating member 3 has sufficient structural strength, and the drainage channel 32 can drain the dirt located near the inner side between the first insulating member 3 and the housing or cover. When the ratio of the depth of the drainage channel 32 to the dimension of the first insulating member 3 extending along the width direction of the drainage channel 32 is set to 0.15, the depth of the drainage channel 32 is too large, resulting in insufficient structural strength of the first insulating member 3.

[0184] In some embodiments, the first insulating member 3 is circular, and the drainage groove 32 is arranged radially along the first insulating member 3. In this case, the dimension of the first insulating member 3 extending along the width direction of the drainage groove 32 is the diameter of the first insulating member 3. The ratio of the depth of the drainage groove 32 to the diameter of the first insulating member 3 is set to 0.02, 0.04, 0.06, 0.08, 0.1, or any value between any two.

[0185] In some embodiments, the first insulating member 3 is rectangular. The drainage channel 32 is arranged along the width direction of the first insulating member 3, and the dimension by which the first insulating member 3 extends along the width direction of the drainage channel 32 is the width of the first insulating member 3. Alternatively, the drainage channel 32 is arranged along the length direction of the first insulating member 3, and the dimension by which the first insulating member 3 extends along the width direction of the drainage channel 32 is the length of the first insulating member 3.

[0186] Please continue reading. Figure 8 In some embodiments, the height of the drainage groove 32 is defined along the axial direction of the first insulating member 3. The height of the drainage groove 32 is H3, and the thickness of the first insulating member 3 is D7, satisfying: 0.05≤H3 / D7≤0.4.

[0187] It is understandable that the ratio of the height of the drainage trough 32 to the thickness of the first insulating member 3 is set in the range of 0.05 to 0.4 so that the drainage trough 32 has sufficient height to allow cleaning water to enter the drainage trough 32 to rinse the area between the first insulating member 3 and the housing or cover plate, and to allow the cleaning water to be discharged from the drainage trough 32, while ensuring that the first insulating member 3 has sufficient strength.

[0188] When the ratio of the height of the drainage channel 32 to the thickness of the first insulating member 3 is set to 0.03, the height of the drainage channel 32 is too small, and the cleaning water cannot enter the drainage channel 32 to rinse the area between the first insulating member 3 and the shell or cover plate; nor can the residual cleaning water between the first insulating member 3 and the shell or cover plate be discharged through the drainage channel 32. When the ratio of the height of the drainage channel 32 to the thickness of the first insulating member 3 is set to 0.2, the first insulating member 3 has sufficient strength, and the cleaning water can enter the drainage channel 32 to rinse the area between the first insulating member 3 and the shell or cover plate. When the ratio of the height of the drainage channel 32 to the thickness of the first insulating member 3 is set to 0.5, the height of the drainage channel 32 is too large, resulting in too many hollow areas in the first insulating member 3, and insufficient strength of the first insulating member 3.

[0189] In some embodiments, the ratio of the height of the drainage groove 32 to the thickness of the first insulating member 3 is set to 0.05, 0.1, 0.2, 0.3, 0.4, or any value between the two.

[0190] like Figure 11 As shown, in some embodiments, the second insulating member 4 includes an insulating section 41 and a crimping section 42 connected to the inner periphery of the insulating section 41. The crimping section 42 is crimped onto the third sealing portion 53.

[0191] Understandably, the insulating section 41 of the second insulating member 4 primarily serves an insulating function and also forms a crimp with the housing and the pressure ring 22. The crimping section 42 also serves an insulating function, mainly used to crimp the sealing member 5 so that the sealing member 5 deforms to form the third sealing part 53. Specifically, the upper surface of the crimping section 42 is crimped with the third sealing part 53, and the lower surface of the crimping section 42 abuts against the pressure ring 22.

[0192] In some embodiments, the crimping section 42 and the insulating section 41 are integrally formed. The thickness of the crimping section 42 is less than the thickness of the insulating section 41. Specifically, the upper surface of the crimping section 42 and the upper surface of the insulating section 41 have a height difference, and the lower surface of the crimping section 42 and the lower surface of the insulating section 41 also have a height difference.

[0193] The upper surface of the insulating section 41 abuts against the housing or cover plate. Since there is a height difference between the upper surface of the crimping section 42 and the upper surface of the insulating section 41, a gap can be formed between the crimping section 42 and the housing or cover plate. This gap can be used to accommodate the third sealing part 53 so that the third sealing part 53 can seal the area.

[0194] Please continue reading. Figure 11 In some embodiments, the thickness of the insulating section 41 is D8 and the thickness of the crimping section 42 is D9, satisfying: 0.15≤D9 / D8≤0.65.

[0195] Understandably, setting the ratio of the thickness of the insulating section 41 to the thickness of the crimping section 42 within the range of 0.15 to 0.65 ensures that the second insulating member 4 has sufficient strength to prevent it from breaking due to external force, while also avoiding excessive interference between the sealing member 5 and the second insulating member 4, which could cause the first insulating member 3 to be squeezed and broken.

[0196] When the ratio of the thickness of the insulating section 41 to the thickness of the crimping section 42 is set to 0.05, the thickness of the crimping section 42 is too small, making the second insulating member 4 prone to breakage. Specifically, the connection between the crimping section 42 and the insulating section 41 is prone to breakage. When the ratio of the thickness of the insulating section 41 to the thickness of the crimping section 42 is set to 0.5, the second insulating member 4 is less prone to breakage and will not be crushed by the third sealing part 53. When the ratio of the thickness of the insulating section 41 to the thickness of the crimping section 42 is set to 0.8, the thickness of the crimping section 42 is too large, resulting in a large interference fit between the crimping section 42 and the third sealing part 53. In this case, the third sealing part 53 will exert a large force on the crimping section 42, causing the crimping section 42 to be crushed.

[0197] In some embodiments, the ratio of the thickness of the insulating section 41 to the thickness of the crimped section 42 is set to 0.15, 0.25, 0.35, 0.45, 0.55, 0.65, or any value between the two.

[0198] Please continue reading. Figure 11 In some embodiments, the insulating segment 41 includes an insulator segment 411 and a raised sub-segment 412 connected to the outer periphery of the insulator segment 411. A crimped segment 42 is connected to the inner periphery of the insulator segment 411. The raised sub-segment 412 protrudes in a direction away from the main body 1 and is connected to the pressure ring 22 of the pole post assembly 2.

[0199] Understandably, the insulator segment 411 is designed as a ring, the crimping segment 42 is integrally formed on the inner periphery of the insulator segment 411, and the protruding segment 412 is integrally formed on the outer periphery of the insulator segment 411. The upper surface of the insulator segment 411 abuts against the lower surface of the housing or cover plate, and the lower surface of the insulator segment 411 abuts against the upper surface of the pressure ring 22. The protruding segment 412 is arranged around the outer periphery of the pressure ring 22, thereby achieving a fixed connection between the second insulating member 4 and the pressure ring 22.

[0200] It should be noted that the thickness of the aforementioned insulating segment 41 is the total thickness of the insulator segment 411 and the raised segment 412.

[0201] In some embodiments, the second insulating member 4 is constructed with a first support portion 44 and a second support portion 45 protruding outward along its axial direction. The first support portion 44 and the second support portion 45 both extend circumferentially along the second insulating member 4. The first support portion 44 and the second support portion 45 are arranged radially apart along the second insulating member 4 and define a drain groove 46. The second support portion 45 is located at the outer periphery of the second insulating member 4, and a drain port 47 is formed on the second support portion 45.

[0202] It is understandable that by constructing a drain groove 46 on the side of the second insulating member 4 facing the main body 1, and constructing a drain port 47 on the outer periphery of the second insulating member 4 that communicates with the drain groove 46, when the electrolyte permeates along the assembly gap between the second insulating member 4 and the housing or cover plate, the electrolyte will enter the area between the second insulating member 4 and the housing or cover plate. At this time, the electrolyte can flow into the drain groove 46 and return from the drain port 47 to the space where the electrode assembly is located, thus preventing the electrolyte from accumulating in the drain groove 46 and causing corrosion of the main body 1. Therefore, it is possible to prevent the electrolyte from contacting the main body 1 and avoid corrosion of the main body 1.

[0203] The side of the second insulating member 4 facing the main body 1 is the side of the second insulating member 4 furthest from the electrode assembly. Both the electrode assembly and the electrolyte are located within the housing. When the electrolyte in the housing permeates through the assembly gap between the second insulating member 4 and the housing or cover plate, the electrolyte flows to the side of the second insulating member 4 furthest from the electrode assembly. Since a drain groove 46 is formed on this side of the second insulating member 4, the electrolyte enters the drain groove 46. Because the drain groove 46 has a certain depth, the electrolyte will not contact the housing or cover plate, preventing corrosion of the housing or cover plate. Simultaneously, since the second insulating member 4 has a drain port 47 around its periphery, the drain port 47 can promptly discharge the electrolyte from the drain groove 46, preventing the electrolyte from accumulating in the drain groove 46 and causing corrosion of the housing or cover plate.

[0204] The first support portion 44 and the second support portion 45 can abut against the main body 1, thereby supporting the main body 1. Furthermore, the first support portion 44 and the second support portion 45 protrude outwards from the second insulating member 4, further reinforcing the second insulating member 4 and preventing it from bending or deforming. Specifically, the first support portion 44 is positioned near the inner periphery of the second insulating member 4, and the second support portion 45 is positioned near the outer periphery of the second insulating member 4. Both provide structural reinforcement at two locations on the circumference of the second insulating member 4 and support at two locations on the circumference of the main body 1.

[0205] The second insulating member 4 is typically located at the upper part of the individual battery cell. The reinforcing rib 43, the first support portion 44, and the second support portion 45 are all located on the upper surface of the second insulating member 4, thus defining a drain groove 46 with its opening facing away from the electrode assembly. When electrolyte seeps through the assembly gap between the second insulating member 4 and the housing or cover plate, it enters the area between the second insulating member 4 and the housing or cover plate, where it can then flow into the drain groove 46. By providing a drain port 47 on the second support portion 45, the electrolyte flowing into the drain groove 46 is discharged, allowing it to flow back to the space where the electrode assembly is located, preventing electrolyte accumulation in the drain groove 46 and thus avoiding corrosion of the housing or cover plate. This prevents the electrolyte from contacting the housing or cover plate, thus avoiding corrosion.

[0206] A second support portion 45 is disposed on the outer periphery of the second insulating member 4, thereby forming a drain port 47 on the second support portion 45. The drain port 47 on the second support portion 45 can discharge the electrolyte flowing into the drain tank 46, allowing the electrolyte to flow back from the drain port 47 to the space where the electrode assembly is located, preventing electrolyte from accumulating in the drain tank 46 and causing corrosion of the housing or cover. This prevents the electrolyte from contacting the housing or cover, thus avoiding corrosion of the housing or cover.

[0207] In some embodiments, the drain port 47 is a notch formed on the outer periphery of the second support portion 45, or the drain port 47 is an opening formed on the bottom of the second support portion 45.

[0208] When the drain port 47 is a notch formed on the outer periphery of the second support 45, the electrolyte will flow in all directions after entering the drain tank 46. When the electrolyte flows to the position of the notch, it can be discharged from the notch to avoid the electrolyte accumulating in the drain tank 46 and causing corrosion of the shell or cover plate. The notch can be set as a square notch or a notch of any shape, as long as the electrolyte can flow out from the notch.

[0209] When the drain port 47 is an opening formed at the bottom of the second support 45, the electrolyte will flow in all directions after entering the drain tank 46. When the electrolyte flows to the position of the opening, it can be discharged from the opening to avoid the electrolyte accumulating in the drain tank 46 and causing corrosion to the shell or cover. The opening can be set as a circular opening or an opening of any shape, as long as the electrolyte can flow out from the opening.

[0210] In some embodiments, the drain port 47 forms a notch wall on the second support portion 45, wherein the notch wall is an inclined surface and tilts in a direction away from the axis of the second insulating member 4 along the direction from the main body 1 to the second insulating member 4, or the notch wall is an arc-shaped surface and protrudes outward in a direction away from the axis of the second insulating member 4 along the direction from the main body 1 to the second insulating member 4.

[0211] The notch wall is designed as a slope, and along the direction from the main body 1 to the second insulating member 4, the notch wall slopes away from the axis of the second insulating member 4. This allows the electrolyte to drain quickly from the drain port 47 under gravity, preventing electrolyte accumulation at the drain port 47 and ensuring proper drainage of the drain tank 46. Simultaneously, this slope also helps prevent electrolyte backflow to some extent. That is, it prevents electrolyte located in the electrode assembly area from flowing into the drain tank 46 from the drain port 47.

[0212] The notch wall is designed as an arc shape, and along the direction from the main body 1 to the second insulating member 4, the notch wall protrudes outward in a direction away from the axis of the second insulating member 4. This allows the electrolyte to drain quickly from the drain port 47 under gravity, preventing electrolyte accumulation at the drain port 47 and ensuring proper drainage of the drain tank 46. Simultaneously, the arc shape also helps prevent electrolyte backflow to some extent. That is, it prevents electrolyte located in the electrode assembly area from flowing into the drain tank 46 from the drain port 47.

[0213] In some embodiments, the notch is a rectangular notch, and the opening of the notch faces away from the central region of the second insulating member 4. It is understood that the notch is set as a rectangle to give it a certain length, so as to facilitate the rapid discharge of electrolyte.

[0214] like Figure 12 As shown, in some embodiments, the second insulating member 4 is provided with a second reinforcing rib 43 protruding outward along its axial direction. The second reinforcing rib 43 extends radially along the second insulating member 4.

[0215] Understandably, the second reinforcing rib 43 can structurally strengthen the second insulating member 4 to prevent it from bending and deforming. Specifically, the second reinforcing rib 43 can provide structural reinforcement in the radial direction of the second insulating member 4.

[0216] Please continue reading. Figure 12 In some embodiments, the two ends of the second reinforcing rib 43 are connected to the first support portion 44 and the second support portion 45, respectively.

[0217] It is understandable that the first support portion 44 and the second support portion 45 can structurally reinforce the second insulating member 4 to prevent it from bending and deforming. Specifically, the first support portion 44 and the second support portion 45 can provide structural reinforcement in the circumferential direction of the second insulating member 4.

[0218] Please continue reading. Figure 12In some embodiments, the second insulating member 4 has at least two circumferential reinforcing ribs 43, and the first support portion 44, the second support portion 45, and each pair of adjacent second reinforcing ribs 43 together define a liquid groove 46 on the second insulating member 4.

[0219] Understandably, providing at least two reinforcing ribs 43 can further enhance the structural strength of the second insulating member 4. The first support portion 44, the second support portion 45, and every two adjacent reinforcing ribs 43 together define a drain groove 46 on the second insulating member 4. Thus, there is no need to perform grooving on the second insulating member 4, which simplifies the production process and improves production efficiency. For example, four reinforcing ribs 43 can be provided, forming four drain grooves 46 in the area between the first support portion 44 and the second support portion 45.

[0220] In some embodiments, the protrusion heights of the second reinforcing rib 43, the first support portion 44, and the second support portion 45 are the same. In this case, the top surface of the second insulating member 4 can be kept flush, which is beneficial for manufacturing and aesthetics. Alternatively, the protrusion heights of the first support portion 44, the second support portion 45, and the reinforcing rib 43 may be different.

[0221] like Figure 13 As shown, in some embodiments, the depth of the drain trough 46 is H4, and the thickness of the second insulating member 4 is D10, satisfying: 0.05≤H4 / D10≤0.3.

[0222] It is understandable that the ratio of the depth of the drain tank 46 to the thickness of the second insulating member 4 is set in the range of 0.05 to 0.3 to ensure that the drain tank 46 has enough space to store the electrolyte, avoid the electrolyte from contacting the shell or cover plate and causing corrosion, and also avoid the second insulating member 4 from being deformed due to insufficient strength.

[0223] When the thickness of the second insulating member 4 is constant, the greater the ratio of the depth of the drain trough 46 to the thickness of the second insulating member 4, the greater the depth of the drain trough 46; the smaller the ratio of the depth of the drain trough 46 to the thickness of the second insulating member 4, the smaller the depth of the drain trough 46.

[0224] When the ratio of the depth of the drain tank 46 to the thickness of the second insulating member 4 is set to 0.03, the depth of the drain tank 46 is too small, making it unable to store electrolyte. After the electrolyte penetrates into the area between the second insulating member 4 and the shell or cover, it will directly contact the shell or cover, causing corrosion. When the ratio of the depth of the drain tank 46 to the thickness of the second insulating member 4 is set to 0.15, the drain tank 46 has sufficient space to store electrolyte, and the second insulating member 4 has sufficient structural strength. When the ratio of the depth of the drain tank 46 to the thickness of the second insulating member 4 is set to 0.5, the depth of the drain tank 46 is too large, resulting in low structural strength of the second insulating member 4 and making it prone to deformation.

[0225] In some embodiments, the ratio of the depth of the drain trough 46 to the thickness of the second insulating member 4 is set to 0.05, 0.1, 0.15, 0.2, 0.25, 0.3, or any value between the two.

[0226] In some embodiments, at least two drain ports 47 are provided at intervals on the second support portion 45 along the circumference of the second insulating member 4. The at least two drain ports 47 are arranged equidistantly or unequally. For example, the at least two drain ports 47 are arranged centrally symmetrically about the center of the second insulating member 4.

[0227] Please continue reading. Figure 12 In some embodiments, the width of the drain port 47 is F2, which satisfies: 1 mm ≤ F2 ≤ 8 mm.

[0228] Understandably, setting the width of the drain port 47 within the range of 1 mm to 8 mm ensures that the drain port 47 can drain the electrolyte located in the drain tank 46. At the same time, the drain port 47 can also serve as a positioning structure for riveting the second insulating component 4. If the width of the drain port 47 is too large, it will lead to an increase in the positioning deviation of the rivets of the second insulating component 4.

[0229] When the width of the drain port 47 is set to 0.5 mm, the electrolyte in the drain tank 46 cannot flow back to the space where the electrode assembly is located through the drain port 47. The electrolyte will accumulate in the drain tank 46 and overflow the opening of the drain tank 46, causing corrosion of the shell or cover plate. When the width of the drain port 47 is set to 10 mm, the positioning deviation of the rivet of the second insulating component 4 is too large.

[0230] In some embodiments, the width of the drain port 47 is set to 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, or any value between the two.

[0231] Please continue reading. Figure 12In some embodiments, the side of the second insulating member 4 facing away from the main body member 1 is provided with a relief groove 48, which is configured as an expansion region of the electrode assembly.

[0232] It is understandable that as the individual battery cells cycle through charging and discharging, the electrode assembly will expand to a certain extent, forming a relief groove 48 on the second insulating member 4, so that the relief groove 48 serves as the expansion area of ​​the electrode assembly, preventing the electrode assembly from being squeezed by the second insulating member 4 after expansion and affecting its performance.

[0233] The embodiments of the present invention have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of the present invention. 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 the present invention. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A seal structure, characterized by, The utility model relates to a sealing structure of a battery pole, which comprises: a main body (1) configured with a mounting hole (11); a pole assembly (2) arranged in the mounting hole (11); a first insulating piece (3) arranged on a first side (12) of the main body (1), and the first insulating piece (3) abuts against the pole assembly (2); a second insulating piece (4) arranged on a second side (13) of the main body (1), and the second insulating piece (4) abuts against the pole assembly (2); a sealing piece (5) comprising a first sealing part (51), a second sealing part (52) and a third sealing part (53) integrally formed, the first sealing part (51) is located between the main body (1) and the axial gap of the pole assembly (2), the second sealing part (52) is located between the main body (1) and the radial gap of the pole assembly (2), and the third sealing part (53) is located between the main body (1) and the second insulating piece (4).

2. The seal structure of claim 1, wherein The first sealing part (51) comprises a first sealing section (511) pressed between the main body (1) and the first insulating piece (3), and a second sealing section (512) pressed between the main body (1) and the axial gap of the pole assembly (2), and along the radial direction of the first sealing part (51), one end of the first sealing section (511) is connected with the second sealing section (512), and the other end of the first sealing section (511) abuts against the first insulating piece (3).

3. The seal structure of claim 2, wherein The height of the first sealing section (511) is less than the height of the second sealing section (512).

4. The sealed structure of claim 2 or 3, wherein, The compression rate of the first sealing section (511) is A11, and 5%≤A11≤25% is satisfied.

5. The seal structure of any one of claims 2 to 4, wherein, The compression rate of the second sealing section (512) is A12, and 15%≤A12≤70% is satisfied.

6. The seal structure of any one of claims 1 to 5, wherein, The third sealing part (53) is pressed between the main body (1) and the second insulating piece (4), and along the radial direction of the third sealing part (53), one end of the third sealing part (53) abuts against the pole assembly (2), and the other end of the third sealing part (53) abuts against the second insulating piece (4), wherein the compression rate of the third sealing part (53) is A3, and 15%≤A3≤65% is satisfied.

7. The seal structure of any one of claims 1 to 6, wherein, The thickness of the third sealing part (53) is D1, and 0.1 millimeter≤D1≤1.0 millimeter is satisfied.

8. The seal structure of any one of claims 1 to 7, wherein, The length of the third sealing part (53) is L1, and 0.1 millimeter≤L1≤1.5 millimeter is satisfied.

9. The seal structure of any one of claims 1 to 8, wherein, The sealing member (5) has a first state and a second state, in the first state, the second sealing part (52) and the third sealing part (53) are an integral segment, and are arranged at an angle with the first sealing part (51), in the second state, one end of the integral segment away from the first sealing part (51) is compressed to form the second sealing part (52) and the third sealing part (53), wherein the sealing member (5) is configured to switch from the first state to the second state after being extruded by the main body member (1), the pole column assembly (2), the first insulation member (3) and the second insulation member (4).

10. The seal structure of claim 9, wherein In the first state, the sealing member (5) has a stage (54) protruding radially outward, and the area between the bottom surface of the stage (54) and the top surface of the sealing member (5) defines the sealing height of the sealing member (5), wherein the thickness of the stage (54) is D2, the sealing height is H1, and 0.2≤D2 / H1≤0.75 is satisfied.

11. The sealed structure of claim 10, wherein, In the first state, the thickness of the sealing member (5) is D3, and the thickness of the main body member (1) is D4, and 1.2≤(D3-H1) / D4≤2.0 is satisfied.

12. The seal structure of any one of claims 1 to 11, wherein, The first insulation member (3) is provided with a first reinforcing rib (31) away from the main body member (1), and the first reinforcing rib (31) abuts against the pole column assembly (2) in the axial direction of the sealing structure.

13. The sealed structure of claim 12, wherein, The thickness of the first reinforcing rib (31) is D5, and 0.03mm≤D5≤0.1mm is satisfied.

14. The sealed structure of claim 12 or 13, wherein, The first reinforcing ribs (31) are arranged at intervals along the circumference of the first insulation member (3) and are at least two.

15. The sealed structure of claim 14, wherein, The adjacent angle of every adjacent two first reinforcing ribs (31) is B1, and 20°≤B1≤120° is satisfied.

16. The sealed structure of any one of claims 1 to 15, wherein, The first insulation member (3) is provided with a drainage groove (32) on the circumference of the side facing the main body member (1).

17. The sealed structure of claim 16, wherein, The drainage grooves (32) are arranged at intervals along the circumference of the first insulation member (3) and are at least two.

18. The sealed structure of claim 17, wherein, The width of the drainage groove (32) is positively correlated with the size of the first insulation member (3) extending in the width direction of the drainage groove (32).

19. The sealed structure of claim 18, wherein, The width of the drainage groove (32) is F1, the diameter of the first insulation member (3) is D6, and the corresponding central angle of the drainage groove (32) is B2, and F1=π*D6*B2 / 360 is satisfied.

20. The sealed structure of any one of claims 16-19, wherein, The width of the drainage groove (32) is F1, and 1mm≤F1≤15mm is satisfied.

21. The sealed structure of any one of claims 16 to 20, wherein, The depth of the drainage groove (32) is defined along the radial direction of the first insulation member (3), the depth of the drainage groove (32) is H2, the size of the first insulation member (3) extending in the width direction of the drainage groove (32) is D6, and 0.02≤H2 / D6≤0.1 is satisfied.

22. The sealed structure of any one of claims 16 to 21, wherein, The height of the drainage groove (32) is defined along the axial direction of the first insulation member (3), the height of the drainage groove (32) is H3, and the thickness of the first insulation member (3) is D7, and 0.05≤H3 / D7≤0.4 is satisfied.

23. The sealed structure of any one of claims 1 to 22, wherein, The second insulation piece (4) comprises an insulation section (41) and a press-fit section (42) connected to the inner periphery of the insulation section (41), wherein the press-fit section (42) is press-fitted to the third sealing portion (53).

24. The sealed structure of claim 23, wherein, The thickness of the insulation section (41) is D8, and the thickness of the press-fit section (42) is D9, satisfying 0.15≤D9 / D8≤0.

65.

25. The sealed structure of claim 23 or 24, wherein, The insulation section (41) comprises an insulation sub-section (411) and a protruding sub-section (412) connected to the outer periphery of the insulation sub-section (411), wherein the press-fit section (42) is connected to the inner periphery of the insulation sub-section (411), the protruding sub-section (412) is protruded away from the main body piece (1), and the protruding sub-section (412) is connected to the press ring (22) of the pole assembly (2).

26. The sealed structure of any one of claims 1 to 25, wherein, The second insulation piece (4) is configured with a first support portion (44) and a second support portion (45) which are protruded outward along the axial direction of the second insulation piece (4), the first support portion (44) and the second support portion (45) both extend along the circumferential direction of the second insulation piece (4), the first support portion (44) and the second support portion (45) are arranged in a spaced apart manner along the radial direction of the second insulation piece (4) and define a liquid discharge groove (46), the second support portion (45) is located at the outer periphery of the second insulation piece (4), and a liquid discharge opening (47) is formed on the second support portion (45).

27. The sealed structure of claim 26, wherein, The liquid discharge opening (47) is a notch formed on the outer periphery of the second support portion (45), or the liquid discharge opening (47) is an opening formed on the bottom of the second support portion (45).

28. The sealed structure of claim 27, wherein, The liquid discharge opening (47) forms a notch wall on the second support portion (45), wherein the notch wall is an inclined surface which is inclined away from the axis of the second insulation piece (4) along the direction from the main body piece (1) to the second insulation piece (4), or the notch wall is an arc surface which is outwardly protruded away from the axis of the second insulation piece (4) along the direction from the main body piece (1) to the second insulation piece (4).

29. The sealed structure of claim 28, wherein, The notch is a rectangular notch, and the opening of the notch faces away from the central region of the second insulation piece (4).

30. The sealed structure of any one of claims 26-29, wherein, The second insulation piece (4) is further configured with a second reinforcing rib (43) which is protruded outward along the axial direction of the second insulation piece (4), wherein the second reinforcing rib (43) extends along the radial direction of the second insulation piece (4).

31. The sealed structure of claim 30, wherein, The two ends of the second reinforcing rib (43) are connected to the first support portion (44) and the second support portion (45), respectively.

32. The sealed structure of claim 31, wherein, The second insulation piece (4) is circumferentially provided with at least two second reinforcing ribs (43), the first support portion (44), the second support portion (45), and every two adjacent second reinforcing ribs (43) together define a liquid discharge groove (46) on the second insulation piece (4).

33. The sealed structure of any one of claims 30-32, wherein, The protruding height of the second reinforcing rib (43), the protruding height of the first support portion (44), and the protruding height of the second support portion (45) are the same.

34. The sealed structure of any one of claims 26-33, wherein, The groove depth of the liquid drainage groove (46) is H4, the thickness of the second insulation piece (4) is D10, and 0.05≤H4 / D10≤0.3 is satisfied.

35. The sealed structure of any one of claims 26-34, wherein, The width of the liquid drainage port (47) is F2, and 1 millimeter≤F2≤8 millimeters is satisfied.

36. The sealed structure of any one of claims 26-35, wherein, The side of the second insulation piece (4) facing away from the main body piece (1) is configured with a relief groove (48) configured as an expansion area of an electrode assembly.

37. A housing assembly characterized by, The sealed structure as claimed in any one of claims 1 to 36, wherein the main body piece (1) is a housing.

38. A cover plate assembly characterized by, The sealed structure as claimed in any one of claims 1 to 36, wherein the main body piece (1) is a cover plate.

39. A monobloc cell characterized by, The housing assembly as claimed in claim 37, or the cover plate assembly as claimed in claim 38.

40. A battery pack, comprising: The single cell as claimed in claim 39.

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