A cap assembly

Abstract

The application discloses a top cover assembly, which comprises a top cover sheet, a pole and a sealing ring, wherein the top cover sheet is provided with a mounting hole; the pole comprises a pole body and a riveting connecting part; the pole body is arranged in the mounting hole; the riveting connecting part is arranged on the outer circumferential side of one end of the pole body away from the battery cell; along the axial direction of the pole body, the orthographic projection of the riveting connecting part and the orthographic projection of the top cover sheet at least partially coincide; the sealing ring is used for insulation between the outer circumferential side of the pole body and the inner circumferential side of the mounting hole; since the pole comprises the pole body and the riveting connecting part, and along the axial direction of the pole body, the orthographic projection of the riveting connecting part and the orthographic projection of the top cover sheet at least partially coincide, that is, the riveting connecting part and the top cover sheet coincide in the axial direction, the axial thrust test requirement of the pole can be met, and the service performance of the pole is ensured.

Description

Technical Field

[0001] This application relates to the field of battery technology, and more particularly to a top cover assembly. Background Technology

[0002] A battery typically consists of a casing, battery cells, and a top cover assembly. The battery cells are housed within the casing, and the top cover assembly is connected to the casing to seal it. The top cover assembly is also electrically connected to the battery cells to output electrical energy.

[0003] In the top cover assembly, the terminals pass through the top cover plate to connect the battery cell to external devices; however, during use, it is difficult to ensure that the terminals are fixed, which can cause the battery tabs to be pulled and broken, affecting the battery's lifespan. Utility Model Content

[0004] This application provides a top cover assembly that improves the connection and fixation between the pole and the top cover plate, thereby at least partially solving the above-mentioned technical problems.

[0005] To achieve the above objectives, according to a first aspect of this application, a top cover assembly is provided, comprising:

[0006] Top cover plate, wherein the top cover plate is provided with mounting holes;

[0007] The electrode post includes an electrode post body and a riveting connection portion. The electrode post body passes through the mounting hole, and the riveting connection portion is located on the outer periphery of the end of the electrode post body away from the battery cell. Along the axial direction of the electrode post body, the orthographic projection of the riveting connection portion and the orthographic projection of the top cover plate at least partially coincide; and,

[0008] A sealing ring, at least partially disposed between the pole body and the mounting hole, is provided for insulation between the outer peripheral side of the pole body and the inner peripheral side of the mounting hole.

[0009] Optionally, the top cover assembly further includes a first insulating member, at least a portion of which is disposed on the side of the top cover sheet near the battery cell for insulation between the pole body and the side of the top cover sheet (11) near the battery cell.

[0010] Optionally, the top cover assembly further includes an encapsulation body, at least a portion of which is disposed between the top cover sheet and the first insulating member. The encapsulation body is sleeved on the electrode post to provide insulation between the side of the top cover sheet near the battery cell and the electrode post.

[0011] Optionally, the top cover sheet is provided with a first clearance portion, which protrudes from the side of the top cover sheet opposite to the first insulating member, to avoid the encapsulated body; and / or,

[0012] The first insulating member is provided with a second clearance portion, which protrudes from the side of the first insulating member away from the top cover sheet, in order to avoid the encapsulated body.

[0013] Optionally, when the top cover includes a first clearance portion and the first insulating member includes a second clearance portion, the first clearance portion and the second clearance portion are correspondingly arranged, and a clearance space is formed between the first clearance portion and the second clearance portion, the clearance space being used to accommodate the encapsulated body.

[0014] Optionally, the pole includes:

[0015] An electrode body, the electrode body passing through the mounting hole; and...

[0016] A protrusion is provided on the outer periphery of the pole body;

[0017] The encapsulated body has a notch, and the protrusion is connected to the notch.

[0018] Optionally, an anti-twist structure is provided between the encapsulated body and the top cover sheet.

[0019] Optionally, the anti-torsion structure includes a protrusion disposed on the side of the overmolded body near the top cover sheet; and,

[0020] The anti-torsion structure includes a groove, which is located on the side of the top cover sheet near the rubber body, and the protrusion is connected to the groove.

[0021] Optionally, the protrusions are provided in multiples, and the multiple protrusions are arranged circumferentially at intervals along the coating body.

[0022] Optionally, the top cover assembly further includes a second insulating member, at least a portion of which is disposed between the periphery of the mounting hole and the pole post for insulation between the periphery of the mounting hole and the pole post.

[0023] Optionally, the second insulating element includes:

[0024] A first connecting portion is located between the pole body and the periphery of the mounting hole for insulation between the pole body and the periphery of the mounting hole.

[0025] A second connecting portion, located between the riveted connecting portion and the side of the top cover plate opposite to the battery cell, serves as insulation between the riveted connecting portion and the side of the top cover plate opposite to the battery cell; and,

[0026] A third connecting portion is located on the outer periphery of the riveted connecting portion for insulation of the outer periphery of the riveted connecting portion.

[0027] In the top cover assembly of this application embodiment, since the pole post includes a pole post body and a riveted connection part, and along the axial direction of the pole post body, the orthographic projection of the riveted connection part and the orthographic projection of the top cover plate at least partially overlap, that is, there is an axial overlap between the riveted connection part and the top cover plate, which can meet the axial thrust test requirements of the pole post and ensure the performance of the pole post.

[0028] Other features and advantages of this application will be described in detail in the following detailed description section. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] To gain a more complete understanding of this application and its beneficial effects, the following description will be provided in conjunction with the accompanying drawings, wherein the same reference numerals in the following description denote the same parts.

[0031] Figure 1 This is a schematic diagram of the structure of the top cover assembly provided in an exemplary embodiment of this disclosure;

[0032] Figure 2 This is an exploded view of the top cover assembly provided in an exemplary embodiment of this disclosure;

[0033] Figure 3 yes Figure 1 A partial structural cross-sectional view of the top cover assembly shown;

[0034] Figure 4 yes Figure 1 The diagram shows the structure of the pole post in the top cover assembly.

[0035] Figure 5 yes Figure 1 The diagram shows the structure of the encapsulated body in the top cover assembly.

[0036] Figure 6 yes Figure 1 The diagram shows the structure of the top cover plate in the top cover assembly.

[0037] Figure 7 This is a schematic diagram of the structure before the pole is riveted.

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

[0039] 1. Top cover assembly;

[0040] 11. Top cover plate; 111. Mounting hole; 112. First clearance part;

[0041] 12. Pole post; 121. Pole post body; 122. Protrusion; 123. Riveted connection part;

[0042] 13. First insulating component; 131. Second clearance part;

[0043] 14. Encapsulated colloid; 141. Notch;

[0044] 15. Make way;

[0045] 16. Anti-torsion structure; 161. Protrusion; 162. Groove;

[0046] 17. Second insulating component; 171. First connecting part; 172. Second connecting part; 173. Third connecting part;

[0047] 18. Sealing ring. Detailed Implementation

[0048] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the protection scope of this application.

[0049] This application provides a top cover assembly 1, as shown in the reference... Figure 1 and Figure 2 As shown, it includes a top cover plate 11 and a pole post 12. The top cover plate 11 is provided with a mounting hole 111. The pole post 12 includes a pole post body 121 and a riveting connection part 123. The pole post body 121 passes through the mounting hole 111. The riveting connection part 123 is disposed on the outer periphery of the end of the pole post body 121 away from the battery cell. Along the axial direction of the pole post body 121, the orthographic projection of the riveting connection part 123 and the orthographic projection of the top cover plate at least partially overlap.

[0050] In the top cover assembly 1 of this application embodiment, since the pole post 12 includes a pole post body 121 and a riveting connection part 123, and along the axial direction of the pole post body 121, the orthographic projection of the riveting connection part 123 and the orthographic projection of the top cover piece 11 at least partially overlap, that is, there is an axial overlap between the riveting connection part 123 and the top cover piece 11, which can meet the axial thrust test requirements of the pole post 12 and ensure the performance of the pole post 12.

[0051] Understandably, in reference Figure 7As shown, in this embodiment, the pole post 12 is connected to the top cover plate 11 by riveting. Before riveting, the riveting connection part 123 is set perpendicular to the length direction of the top cover plate 11, thereby forming a notch that can be connected by the riveting machine. Under the action of the riveting machine, the riveting connection part 123 is bent to at least partially overlap with the orthographic projection of the top cover plate.

[0052] In some embodiments, the top cover assembly 1 further includes a first insulating member 13, at least a portion of which is disposed on the side of the top cover sheet 11 near the battery cell for insulation between the terminal body 121 and the side of the top cover sheet 11 near the battery cell.

[0053] Thus, the first insulating element 13 can ensure the insulation between the top cover plate 11 and the pole body 121, and prevent the top cover plate 11 and the pole body 121 from being directly connected and causing a short circuit.

[0054] In some embodiments, the top cover assembly 1 further includes an encapsulation body 14, at least a portion of which is disposed between the top cover sheet 11 and the first insulating member 13. The encapsulation body 14 is sleeved on the terminal post 12 for insulation between the side of the top cover sheet 11 near the battery cell and the terminal post 12.

[0055] Thus, the encapsulated body 14 is fitted onto the pole post 12, thereby enhancing the connection stability of the pole post 12 and preventing the pole post 12 from loosening due to mechanical vibration. At the same time, the encapsulated body 14 is disposed between the top cover plate 11 and the first insulating member 13, which can better fill the gap between the top cover plate 11 and the first insulating member 13, increase the structural stability of the top cover assembly 1, and better prevent the pole post 12 from loosening.

[0056] It should also be noted that since the terminal post 12 is located in the mounting hole 111 and the encapsulation body 14 is fitted onto the terminal post 12, the minimum diameter of the terminal post 12 can be appropriately adjusted when the shape of the encapsulation body 14 is fixed. For example, when the standard diameter of the terminal post 12 that the encapsulation body 14 is compatible with is 8mm, batteries with a diameter of 7mm-9mm can also be assembled in the encapsulation body 14, which is highly adaptable. In addition, the diameter of the terminal post 12 and the shape of the encapsulation body 14 can be finely adjusted according to actual usage needs, which is highly flexible.

[0057] Accordingly, the top cover assembly 1 structure of this embodiment can be customized according to actual needs to better increase the flow capacity.

[0058] In some embodiments, refer to Figure 3 As shown, the top cover plate 11 is provided with a first clearance portion 112, which protrudes from the side of the top cover plate 11 opposite to the first insulating member 13, to avoid the encapsulating body 14; and / or,

[0059] The first insulating member 13 is provided with a second clearance portion 131, which protrudes from the side of the first insulating member 13 away from the top cover plate 11, in order to clearance the encapsulated body 14.

[0060] Thus, the first clearance part 112 and the second clearance part 131 can provide assembly space for the coating body 14, and can better realize the assembly of the coating body 14.

[0061] Thus, the first clearance part 112 and the second clearance part 131 can also limit the position of the coating body 14, preventing the coating body 14 from axial displacement during use, and also better ensuring the fixation of the pole post 12.

[0062] In some embodiments, refer to Figure 3 As shown, when the top cover 11 includes a first clearance portion 112 and the first insulating member 13 includes a second clearance portion 131, the first clearance portion 112 and the second clearance portion 131 are arranged in a corresponding manner, and a clearance space 15 is formed between the first clearance portion 112 and the second clearance portion 131. The clearance space 15 is used to accommodate the encapsulated body 14.

[0063] Thus, the encapsulated body 14 is constrained in both the axial and radial directions, which can effectively suppress the displacement of the pole post 12 under vibration and impact conditions and improve the connection reliability.

[0064] It should also be noted that in this embodiment, the pole post 12 is first coated with rubber to form a coated body 14, and then the coated body 14 is assembled into the top cover plate 11 and the first insulating member 13. Therefore, the accommodating space formed by the first clearance part 112 and the second clearance part 131 can quickly realize the positioning of the coated body 14, shorten the assembly cycle, ensure the positioning accuracy by the structure, and reduce the reliance on manual labor.

[0065] In addition, during use, although the encapsulated body 14 is axially limited by the first relief part 112 and the second relief part 131, it will not be excessively squeezed. Therefore, the internal stress of the encapsulated body 14 can be evenly distributed to the first relief part 112 and the second relief part 131, which can prevent the encapsulated body 14 from cracking and better achieve the fixation and insulation of the pole post 12.

[0066] In some embodiments, refer to Figure 4 As shown, the electrode post 12 includes an electrode post body 121 and a protrusion 122. The electrode post body 121 passes through the mounting hole 111; and the protrusion 122 protrudes from the outer periphery of the electrode post body 121; wherein, referring to Figure 5 As shown, the encapsulated body 14 has a notch 141, and the protrusion 122 is connected to the notch 141.

[0067] Thus, the notch 141 and the protrusion 122 cooperate to form a circumferential limit between the pole post 12 and the encapsulated body 14, preventing the pole post 12 from rotating during subsequent assembly and ensuring the pole post 12 is fixed.

[0068] It should also be noted that in this embodiment, there are two protrusions 122, and the protrusions 122 are symmetrically distributed along the outer periphery of the pole post 12. Therefore, during the assembly of the coating body 14, the coating body 14 is subjected to uniform force, which can avoid local stress concentration leading to cracking.

[0069] Furthermore, in this embodiment, the electrode post 12 is a composite electrode post 12, which is composed of a copper block and an aluminum block, and both the copper block and the aluminum block are provided with protrusions 122. Therefore, through the cooperation of the protrusions 122 and the notch 141, the copper block and the aluminum block can be better connected, ensuring the normal use of the electrode post 12.

[0070] In some embodiments, refer to Figure 5 and Figure 6 As shown, an anti-twist structure 16 is provided between the encapsulated body 14 and the top cover plate 11.

[0071] Thus, the pole post 12 and the encapsulated body 14 achieve a first anti-rotation through the cooperation of the protrusion 122 and the notch 141, and the anti-torsion structure 16 between the encapsulated body 14 and the top cover plate 11 achieves a second anti-rotation, thus forming a "two-level interlocking", which can effectively prevent the pole post 12 from rotating and ensure the pole post 12 is fixed on the top cover plate 11.

[0072] Thus, the anti-torsion structure 16 creates a mechanical interlock between the overlay 14 and the top cover plate 11, restricting circumferential rotation and / or axial displacement between them. This reduces the risk of loosening between the terminal post 12, the overlay 14, and the top cover plate 11 due to vibration or thermal stress. Simultaneously, the precise alignment between the overlay 14 and the top cover plate 11 simplifies the installation of the top cover assembly 1 and improves the battery's sealing performance, making it suitable for more demanding battery applications.

[0073] In some embodiments, refer to Figure 5 and Figure 6 As shown, the anti-torsion structure 16 includes a protrusion 161, which is disposed on the side of the overcoated body 14 near the top cover sheet 11; and the anti-torsion structure 16 includes a groove 162, which is disposed on the side of the top cover sheet 11 near the overcoated body 14, and the protrusion 161 and the groove 162 are connected in a mating manner.

[0074] In this way, the protrusion 161 can be formed in one step in the mold of the coating 14, and the groove 162 can also be formed quickly in the processing of the top cover 11, making the production process simple and easy to implement.

[0075] Thus, the protrusion 161 and the groove 162 can fix the relative position of the encapsulated body 14 and the top cover plate 11, so that the pole post 12, the encapsulated body 14 and the top cover plate 11 are relatively fixed, ensuring the stability of the top cover assembly 1.

[0076] However, this design is not limited to this. In other embodiments, the groove 162 can be provided on the side of the overmolded body 14 near the top cover plate 11, and the protrusion 161 can be provided on the side of the top cover plate 11 near the overmolded body 14. Through the interference fit or snap-fit ​​between the protrusion 161 and the groove 162, the interlock between the overmolded body 14 and the top cover plate 11 is realized, thereby restricting the radial displacement and circumferential rotation between the overmolded body 14 and the top cover plate 11. Moreover, the preparation of the protrusion 161 and the groove 162 is relatively simple and the cost is low.

[0077] It is understood that in other embodiments, the anti-torsion structure 16 may also be a fit between internal and external threads, so that the rubber body 14 and the top cover plate 11 achieve a threaded fit, thereby achieving higher connection strength and sealing performance.

[0078] In some embodiments, a plurality of protrusions 161 are provided, and the plurality of protrusions 161 are arranged circumferentially spaced along the overlay body 14.

[0079] Thus, by setting multiple protrusions 161, the force between the encapsulated body 14 and the top cover plate 11 is more uniform, avoiding cracking or plastic deformation of the encapsulated body 14 due to local stress concentration.

[0080] It is understood that in this embodiment, there are four protrusions 161, which are evenly spaced on the outer periphery of the coating body 14. Correspondingly, there are also four grooves 162. Of course, in other embodiments, the number of protrusions 161 can be set to different numbers, which will not be elaborated here.

[0081] In some embodiments, the pole post 12 is riveted to the top cover plate 11.

[0082] In this way, by riveting the pole post 12 to the top cover plate 11, the high temperature during the welding process can be avoided from causing the coating 14 to melt, thereby ensuring the sealing of the coating 14, avoiding leakage or short circuit, and improving the safety performance of the top cover assembly 1.

[0083] Furthermore, by omitting the welding process, the defect rate caused by welding can be reduced, ensuring the quality of the top cover assembly 1 and improving the product qualification rate and product reliability of the top cover assembly 1.

[0084] In some embodiments, the top cover assembly 1 further includes a second insulating member 17, at least a portion of which is disposed between the periphery of the mounting hole 111 and the pole post 12 for insulating the periphery of the mounting hole 111 from the pole post 12.

[0085] Thus, the encapsulation 14 achieves insulation between the terminal post 12 and the top cover plate 11 on the side facing the battery cell, while the second insulating member 17 can ensure insulation between the periphery of the mounting hole 111 and the terminal post 12. Therefore, by setting the second insulating member 17, insulation between the terminal post 12 and the top cover plate 11 can be guaranteed, and the encapsulation 14 together achieves double protection.

[0086] In some embodiments, the second insulating member 17 includes a first connecting portion 171, a second connecting portion 172, and a third connecting portion 173. The first connecting portion 171 is located between the pole body 121 and the peripheral side of the mounting hole 111 for insulation between the pole body 121 and the peripheral side of the mounting hole 111. The second connecting portion 172 is located between the riveting connecting portion 123 and the side of the top cover plate 11 away from the battery cell for insulation between the riveting connecting portion 123 and the side of the top cover plate 11 away from the battery cell. The third connecting portion 173 is located on the outer peripheral side of the riveting connecting portion 123 for insulation of the outer peripheral side of the riveting connecting portion 123.

[0087] It should also be noted that in this embodiment, the first connecting part 171 is connected by the second connecting part 172 and the third connecting part 173, and the first connecting part 171, the second connecting part 172 and the third connecting part 173 are arranged sequentially along the axial direction of the pole post 11.

[0088] In this embodiment, since the riveted connection 123 is bent to the horizontal direction, the second insulating member 17 can ensure that the riveted connection 123 can still achieve insulation with the top cover plate 11 after it is bent.

[0089] In this way, the second insulating member 17 can ensure that the terminal post 12 will not come into contact with the top cover plate 11 in multiple directions, so as to avoid short circuit of the battery during use.

[0090] In this embodiment, the top cover assembly 1 further includes a sealing ring 18, at least a portion of which is disposed between the pole body 121 and the mounting hole 111 for insulation between the outer peripheral side of the pole body 121 and the inner peripheral side of the mounting hole 111.

[0091] Thus, by setting the sealing ring 18, the sealing ring 18 can achieve the first seal of the top cover assembly 1, and the second insulating member 17 can achieve the second seal of the top cover assembly 1. Even if one of them fails, the other can still prevent the electrolyte from leaking out, effectively improving the sealing reliability of the top cover assembly 1.

[0092] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0093] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0094] The embodiments, implementation methods, and related technical features of this application can be combined and substituted for each other without conflict.

[0095] The above are merely preferred embodiments of this application and are not intended to limit this application in any way. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of this application without departing from the technical solution of this application shall still fall within the scope of the technical solution of this application.

Claims

1. A cap assembly, characterized by, include: A top cover plate (11), wherein the top cover plate (11) is provided with mounting holes (111); and, The pole (12) includes a pole body (121) and a riveting connection part (123). The pole body (121) passes through the mounting hole (111). The riveting connection part (123) is located on the outer periphery of the end of the pole body (121) away from the battery cell. Along the axial direction of the pole body (121), the orthographic projection of the riveting connection part (123) and the orthographic projection of the top cover plate (11) at least partially overlap.

2. The roof assembly of claim 1, wherein, The top cover assembly (1) further includes a first insulating member (13), at least a portion of which is disposed on the side of the top cover sheet (11) near the battery cell for insulation between the pole body (121) and the side of the top cover sheet (11) near the battery cell.

3. The roof assembly of claim 2, wherein, The top cover assembly (1) further includes an encapsulating body (14), at least a portion of which is disposed between the top cover sheet (11) and the first insulating member (13). The encapsulating body (14) is sleeved on the pole post (12) for insulation between the side of the top cover sheet (11) near the battery cell and the pole post (12).

4. The roof assembly of claim 3, wherein, The top cover plate (11) is provided with a first clearance portion (112), which protrudes from the side of the top cover plate (11) away from the first insulating member (13) to avoid the encapsulated body (14); and / or, The first insulating member (13) is provided with a second avoidance part (131), which protrudes from the side of the first insulating member (13) away from the top cover plate (11) to avoid the encapsulated body (14).

5. The roof assembly of claim 4, wherein, When the top cover (11) includes a first clearance portion (112) and the first insulating member (13) includes a second clearance portion (131), the first clearance portion (112) and the second clearance portion (131) are arranged correspondingly, and a clearance space (15) is formed between the first clearance portion (112) and the second clearance portion (131), the clearance space (15) being used to accommodate the encapsulated body (14).

6. The roof assembly of claim 3, wherein, The pole (12) includes: An electrode body (121) passes through the mounting hole (111); and, A protrusion (122) is provided on the outer periphery of the pole body (121); The encapsulated body (14) has a notch (141), and the protrusion (122) is connected to the notch (141).

7. The roof assembly of any one of claims 3 to 6, wherein, An anti-twist structure (16) is provided between the encapsulated body (14) and the top cover plate (11).

8. The roof assembly of claim 7, wherein, The anti-torsion structure (16) includes a protrusion (161) disposed on the side of the overlay (14) near the top cover (11); and, The anti-torsion structure (16) includes a groove (162), which is located on the side of the top cover (11) near the rubber body (14), and the protrusion (161) is engaged with the groove (162).

9. The roof assembly of claim 8, wherein, The protrusions (161) are provided in multiple ways, and the multiple protrusions (161) are arranged circumferentially at intervals along the coating body (14).

10. The roof assembly of claim 9, wherein, The top cover assembly (1) also includes a second insulating member (17) for insulating the periphery of the mounting hole (111) from the pole post (12).

11. The roof assembly of claim 10, wherein, The second insulating element (17) includes: A first connecting portion (171) is located between the pole body (121) and the periphery of the mounting hole (111) for insulation between the pole body (121) and the periphery of the mounting hole (111). A second connecting portion (172) is located between the riveted connecting portion (123) and the side of the top cover plate (11) opposite to the battery cell, for insulation between the riveted connecting portion (123) and the side of the top cover plate (11) opposite to the battery cell; and, A third connecting part (173) is located on the outer periphery of the riveted connecting part (123) for insulation of the outer periphery of the riveted connecting part (123).

12. The roof assembly of claim 10 or 11, wherein, The top cover assembly (1) also includes a sealing ring (18), at least a portion of which is disposed between the pole body (121) and the mounting hole (111) for insulation between the outer peripheral side of the pole body (121) and the inner peripheral side of the mounting hole (111).

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