Top cover structure and battery

Abstract

The utility model provides a top cover structure and a battery, the top cover structure comprises a sealing member and a cover plate, and the sealing member has a sealing structure; the cover plate is provided with a glue injection hole, the circumferential side face of the glue injection hole is provided with a step structure, the step structure is provided with a step face forming an angle with the axial direction of the glue injection hole, the sealing structure is in sealing butt joint fit with the step face, and the sealing piece seals the glue injection hole. The problem that in the prior art, sealing of the liquid injection hole is high in material and manufacturing cost is solved.

Description

Technical Field

[0001] This application relates to the field of wiring harness technology, and more specifically, to a top cover structure and a battery. Background Technology

[0002] The filling port is the channel for injecting electrolyte into the lithium battery. Currently, the sealing design of the filling port generally involves inserting sealing granules into the filling port after electrolyte injection, simultaneously using the lower plastic of a cover plate to restrain the sealing granules, and then welding a sealing aluminum sheet to create a completely sealed space within the battery cell, thus eliminating the risk of leakage. However, the existing design has the following shortcomings: 1. The sealing granules and the sealing aluminum sheet are two separate materials and require two manufacturing processes, increasing material and manufacturing costs; 2. The currently used sealing aluminum sheet has welding defects, posing a risk of leakage. Utility Model Content

[0003] The main purpose of this application is to provide a top cover structure and a battery to solve the problem of high material and manufacturing costs in sealing the liquid injection hole in the prior art.

[0004] To achieve the above objectives, according to one aspect of this application, a top cover structure is provided, comprising: a seal and a cover plate, the seal having a sealing structure; the cover plate having an injection hole, the circumferential side of the injection hole having a stepped structure, the stepped structure having a stepped surface at an angle to the axial direction of the injection hole, the sealing structure sealingly engaging with the stepped surface, and the seal sealing the injection hole.

[0005] Furthermore, the injection hole includes a large-diameter section, a transition section, and a small-diameter section that are connected by sequential bending. The large-diameter section and the small-diameter section extend along the axial direction of the injection hole, and the large-diameter section and the transition section form a stepped structure, with the stepped surface located in the transition section.

[0006] Furthermore, the transition section includes a sealing groove, which is arranged circumferentially along the transition section, and the sealing structure is in sealing fit with the sealing groove.

[0007] The instruction manual PN311724HZYWDL further states that the opening direction of the sealing groove is along the axial direction of the injection hole.

[0008] Furthermore, both the sealing structure and the sealing groove are annular structures, with the sealing structure located within the sealing groove.

[0009] Furthermore, the sealing structure is interference-fitted with the sealing groove.

[0010] Furthermore, there are multiple sealing structures and sealing grooves, and each sealing structure and sealing groove is set in a one-to-one correspondence.

[0011] Furthermore, the seal also includes a sealing sheet, and the sealing sheet and the sealing structure are an integral structure, with the sealing structure protruding from the surface of the sealing sheet.

[0012] Furthermore, the sealing strip is located within the large-diameter section, and the gap between the peripheral edge of the sealing strip and the side wall of the large-diameter section is set.

[0013] According to another aspect of this application, a battery is provided, including the top cover structure described above.

[0014] By applying the technical solution of this application, a sealing structure is set on the sealing element and sealed with the stepped surface of the cover plate, thereby reducing material usage and reducing costs while achieving a good sealing effect. Specifically, this embodiment eliminates the traditional sealing granule structure and the anti-drop device on the lower plastic to prevent the sealing granules from falling into the cell. Instead, a sealing structure is set on the sealing element, and the sealing structure directly seals with the stepped surface. This reduces material usage, simplifies the assembly process, and improves production efficiency, thereby reducing costs. Furthermore, it ensures a reliable seal between the cover plate and the sealing element, effectively preventing electrolyte leakage and improving battery safety and reliability. Attached Figure Description

[0015] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. In the drawings:

[0016] Figure 1 A schematic diagram of the top cover structure of this application is shown;

[0017] Figure 2 A schematic diagram of the cover plate of this application is shown;

[0018] Figure 3 An enlarged view of the injection hole of this application is shown;

[0019] Figure 4 A cross-sectional view of the injection hole of this application is shown;

[0020] Figure 5 A schematic diagram of the seal of this application is shown;

[0021] Figure 6 It shows Figure 5 Another structural diagram from another angle.

[0022] The above figures include the following reference numerals:

[0023] 10. Seal; 11. Sealing structure; 12. Sealing plate; 20. Cover plate; 21. Injection hole; 211. Large diameter section; 212. Transition section; 2121. Stepped surface; 2122. Sealing groove; 213. Small diameter section. Detailed Implementation

[0024] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0025] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0026] In this application, unless otherwise stated, directional terms such as "upper," "lower," "top," and "bottom" are generally used in relation to the direction shown in the accompanying drawings, or in relation to the vertical, perpendicular, or gravitational direction of the component itself; similarly, for ease of understanding and description, "inner" and "outer" in specification PN311724HZYWDL refer to the inner and outer contours of each component itself, but the above directional terms are not intended to limit this application.

[0027] To address the issue of high cost associated with the sealing structure of the injection hole in the prior art, this application provides a top cover structure and a battery, wherein the battery includes the top cover structure described below.

[0028] like Figures 1 to 6 The top cover structure shown includes: a sealing element 10 and a cover plate 20. The sealing element 10 has a sealing structure 11. The cover plate 20 has an injection hole 21. The circumferential side of the injection hole 21 has a stepped structure. The stepped structure has a stepped surface 2121 that is angled to the axial direction of the injection hole 21. The sealing structure 11 and the stepped surface 2121 are sealed and mated together. The sealing element 10 seals the injection hole 21.

[0029] This embodiment reduces material usage and lowers costs by providing a sealing structure 11 on the sealing element 10 and sealing it with the stepped surface 2121 of the cover plate 20, while achieving a good sealing effect. Specifically, this embodiment eliminates the traditional sealing granule structure and the anti-drop device on the lower plastic to prevent the sealing granules from falling into the battery cell. By providing a sealing structure 11 on the sealing element 10 and directly sealing it with the stepped surface 2121, this reduces material usage, simplifies the assembly process, improves production efficiency, and thus lowers costs. Furthermore, it ensures a reliable seal between the cover plate 20 and the sealing element 10, effectively preventing electrolyte leakage and improving battery safety and reliability.

[0030] like Figure 2 , Figure 3As shown, in this embodiment, the injection hole 21 includes a large-diameter section 211, a transition section 212, and a small-diameter section 213 that are connected by bending in sequence. The large-diameter section 211 and the small-diameter section 213 extend along the axial direction of the injection hole 21. The large-diameter section 211 and the transition section 212 form a stepped structure. The stepped surface 2121 is located in the transition section 212. Thus, by utilizing the cooperation between the stepped surface 2121 and the sealing structure 11, an effective seal is formed, while ensuring the accurate position of the sealing element 10 during the assembly process, thereby providing the sealing element 10 with the dual functions of positioning and sealing. Specifically, in the embodiment of PN311724HZYWDL in this specification, the injection hole 21 is configured as a countersunk hole structure, that is, the transition section 212 is arranged perpendicular to the axial direction of the injection hole 21. The large-diameter section 211 and the small-diameter section 213 are located at opposite ends of the transition section 212, and the diameter of the large-diameter section 211 is larger than the diameter of the small-diameter section 213, thereby forming a stepped structure at the large-diameter section 211 and the transition section 212. The surface of the transition section 212 is the stepped surface 2121. The large-diameter section 211 can extend along the axial direction of the injection hole 21, or it can be... Figure 4 As shown, the sealant 10 is angled to the axial direction of the injection hole 21 to facilitate installation. In this embodiment, the sealing structure 11 is located on the side of the sealant 10 facing the injection hole 21, and the large-diameter section 211 is located on the side of the cover plate 20 close to the sealant 10. This allows the sealing structure 11 to abut against the stepped surface 2121, thereby achieving a seal between the sealant 10 and the injection hole 21. At the same time, the large-diameter section 211 provides a certain positioning function for the sealant 10, facilitating the abutment and engagement of the sealing structure 11 with the stepped surface 2121, thus improving work efficiency.

[0031] In this embodiment, the transition section 212 includes a sealing groove 2122, which is arranged circumferentially along the transition section 212. The sealing structure 11 is sealed and fitted with the sealing groove 2122, thereby providing a more precise positioning and fitting space for the sealing structure 11, making the contact between the sealing element 10 and the cover plate 20 tighter and the sealing effect better. Specifically, the sealing groove 2122 is provided at the stepped surface 2121 of the glue injection hole 21. The sealing groove 2122 can be set as a groove. When the sealing element 10 and the cover plate 20 are sealed and fitted, the sealing structure 11 is embedded in the sealing groove 2122 and abuts against the sealing groove 2122 for sealing. By means of interference fit or welding, it can be ensured that a gapless seal is formed between the sealing structure 11 and the sealing groove 2122. Depending on the actual situation, the sealing groove 2122 can be set as a circular groove, a polygonal groove, or other shapes, as long as the sealing groove 2122 surrounds the transition section 212 at least once.

[0032] In this embodiment, the opening direction of the sealing groove 2122 is along the axial direction of the injection hole 21, thereby providing a smooth path for the installation of the seal 10, reducing installation resistance, and ensuring the stability of the sealing structure 11 in the sealing groove 2122 to prevent displacement during use.

[0033] Instruction manual PN311724HZYWDL Figure 3 , Figure 4 As shown, in this embodiment, the stepped surface 2121 is perpendicular to the axial direction of the injection hole 21, while the opening direction of the sealing groove 2122 is perpendicular to the stepped surface 2121. This ensures that when the sealing member 10 is installed close to the injection hole 21 along its axial direction, the sealing structure 11 can be quickly installed into the sealing groove 2122, thereby improving assembly efficiency. Simultaneously, the sealing structure 11, located within the sealing groove 2122, is less prone to lateral displacement, ensuring the durability and effectiveness of the seal. Of course, depending on actual needs, the opening direction of the sealing groove 2122 can also be inclined to the axial direction of the injection hole 21, as long as the smooth installation and effective sealing of the sealing member 10 are ensured.

[0034] In this embodiment, both the sealing structure 11 and the sealing groove 2122 are annular structures. The sealing structure 11 is located within the sealing groove 2122, thereby achieving an all-around seal between the sealing element 10 and the injection hole 21, preventing electrolyte leakage from any direction. Specifically, the sealing structure 11 in this embodiment is configured as a circular sealing ring, and the sealing groove 2122 is correspondingly configured as an annular groove. When the sealing structure 11 is located within the sealing groove 2122, the sealing fit between the sealing structure 11 and the sealing groove 2122 is always an arc seal, thereby improving the reliability of the seal. At the same time, the annular structure is beneficial to the stability of the fit between the sealing structure 11 and the sealing groove 2122, preventing the sealing structure 11 from coming out of the sealing groove 2122.

[0035] In this embodiment, the sealing structure 11 and the sealing groove 2122 are interference-fitted, thereby utilizing the elastic deformation of the sealing ring to form a tight seal, achieving a good sealing effect without the need for additional adhesives or welding. Specifically, the inner diameter of the sealing structure 11 can be set slightly smaller than the inner diameter of the sealing groove 2122, so that the inner circumferential side of the sealing structure 11 can fit tightly against the inner circumferential sidewall of the sealing groove 2122, thereby ensuring that the sealing ring can effectively seal against the sealing groove 2122 at all circumferential points, thus achieving a reliable seal between the sealing element 10 and the cover plate 20. Simultaneously, the thickness of the sealing structure 11 along the axial direction of the injection hole 21 can be slightly greater than the depth of the sealing groove 2122 along the axial direction of the injection hole 21. This ensures that the fit between the peripheral side of the sealing structure 11 and the peripheral sidewall of the sealing groove 2122 has a certain length along the axial direction of the injection hole 21, thereby further improving the sealing effect. It should be noted that when the sealing element 10 is sealed with the injection hole 21, the deformation of the sealing structure 11 under compression should not exceed the size of the sealing groove 2122 to avoid affecting the fixation of the sealing element 10 and the cover plate 20. Alternatively, the difference between the outer diameter and inner diameter of the sealing structure 11 can be slightly greater than the difference between the outer diameter and inner diameter of the sealing groove 2122. This ensures that when the sealing structure 11 is located within the sealing groove 2122, it can fully fill the sealing groove 2122, thereby achieving a reliable seal.

[0036] In this embodiment, multiple sealing structures 11 and sealing grooves 2122 are included, and the sealing structures 11 and sealing grooves 2122 are arranged in a one-to-one correspondence, so that there are multiple layers of sealing between the sealing element 10 and the cover plate 20, thereby improving the redundancy of the seal. In this way, even if a certain sealing structure 11 or sealing groove 2122 fails, the other sealing structures 11 and sealing grooves 2122 can still maintain the seal between the sealing element 10 and the cover plate 20, thereby enhancing the sealing performance of the battery and improving the reliability and service life of the battery. Specifically, multiple sealing grooves 2122 can be arranged radially along the step surface 2121, and the diameter of each sealing groove 2122 is different. Similarly, sealing structures 11 can be arranged radially along the sealing element 10, and the diameter of each sealing structure 11 is different. The sealing structure 11 closest to the edge of the sealing element 10 cooperates with the sealing groove 2122 closest to the outer peripheral edge of the step surface 2121. Similarly, the other sealing grooves 2122 respectively cooperate with the sealing structures 11 at the corresponding positions, thereby achieving multi-level sealing and further improving the sealing effect of the sealing element 10 and the cover plate 20.

[0037] like Figure 1 , Figure 5 , Figure 6As shown, in this embodiment, the seal 10 also includes a sealing sheet 12. The sealing sheet 12 and the sealing structure 11 are an integral structure. The sealing structure 11 protrudes from the surface of the sealing sheet 12, so that the assembly process of the seal 10 and the cover plate 20 only requires placing the seal 10 as a whole into the injection hole 21, thereby simplifying the installation process and avoiding the multi-step sealing of the sealing glue particles and sealing sheet 12 in the traditional design, which helps to improve assembly efficiency and save costs. Specifically, in this embodiment, the sealing sheet 12 and the sealing structure 11 are integrated. When the sealing element 10 is engaged with the injection hole 21, the sealing structure 11 achieves a circumferential seal with the injection hole 21, while the sealing sheet 12 achieves a planar seal with the injection hole 21. Thus, only the sealing element 10 is needed to effectively seal the sealing element 10 and the cover plate 20. Furthermore, the sealing structure 11 is fixed within the sealing groove 2122, eliminating the need for the constraint structure of sealing adhesive particles in traditional solutions, thereby reducing material and manufacturing costs. In this embodiment, the injection hole 21 is a circular hole, and correspondingly, the sealing sheet 12 is a circular sheet. This allows the sealing structure 11 to be located within the sealing groove 2122, while the sealing sheet 12 is located within the injection hole 21, achieving a seal without protruding from the surface of the cover plate 20, thus optimizing the battery's spatial layout. Of course, when the injection hole 21 is set as a square hole, the sealing sheet 12 can also be adjusted to a square structure to match the injection hole 21.

[0038] In this embodiment, the sealing plate 12 is located within the large-diameter section 211, and a gap is provided between the peripheral edge of the sealing plate 12 and the side wall of the large-diameter section 211. This facilitates the release of welding stress after the sealing plate 12 is welded to the cover plate 20, preventing the stress generated during welding from being unable to be released and causing welding cracks. Specifically, in this embodiment, both the outer peripheral edges of the large-diameter section 211 and the sealing plate 12 are circular, and the outer diameter of the sealing plate 12 is slightly smaller than the diameter of the large-diameter section 211. This creates a gap between the sealing plate 12 and the large-diameter section 211, which on the one hand facilitates the release of welding stress, effectively improves the welding cracks of the sealing plate 12, and thus ensures welding quality and effectively improves the welding yield of the sealing plate 12. On the other hand, it allows for minor deformations generated during the welding process. At the same time, the large-diameter section 211 can constrain the position of the sealing plate 12, thereby constraining the position of the sealing structure 11 to prevent the sealing plate 12 from undergoing lateral displacement, thus ensuring the effective sealing of the sealing element 10 and the cover plate 20.

[0039] like Figure 1As shown, in this embodiment, after the sealing element 10 and the cover plate 20 are sealed together, the surface of the sealing element 10 is flush with the surface of the cover plate 20. That is, the side of the sealing sheet 12 away from the sealing structure 11 is flush with the side of the cover plate 20 away from the small diameter section 213, so as not to occupy additional space of the top cover structure, while ensuring the aesthetics of the top cover structure.

[0040] It should be noted in the instruction manual PN311724HZYWDL that "multiple" in the above embodiments refers to at least two.

[0041] As can be seen from the above description, the embodiments of this application achieve the following technical effects:

[0042] 1. This solves the problem of high cost in the sealing structure of the injection hole in the existing technology;

[0043] 2. By setting a sealing structure on the sealing element and sealing it with the stepped surface of the cover plate, the amount of material used is reduced, which helps to reduce costs and achieve a good sealing effect at the same time.

[0044] 3. The traditional sealing granule structure has been eliminated, as has the anti-drop device on the lower plastic to prevent the sealing granules from falling into the battery cell. Instead, a sealing structure is set on the sealing element, and the sealing structure directly seals with the stepped surface. This reduces material usage, simplifies the assembly process, improves production efficiency, and thus reduces costs. On the other hand, it ensures a reliable seal between the cover plate and the sealing element, effectively preventing electrolyte leakage and improving battery safety and reliability.

[0045] Obviously, the embodiments described above are merely some, not all, of the embodiments in this application. All other embodiments obtained by those skilled in the art based on the embodiments in this application without inventive effort should fall within the scope of protection of this application.

[0046] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0047] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in sequences other than those illustrated or described herein.

[0048] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A top cover structure, characterized in that, include: A sealing element (10) having a sealing structure (11); The cover plate (20) has an injection hole (21). The circumferential side of the injection hole (21) has a stepped structure. The stepped structure has a stepped surface (2121) at an angle to the axial direction of the injection hole (21). The sealing structure (11) is sealed and mated with the stepped surface (2121). The sealing element (10) seals the injection hole (21).

2. The top cover structure according to claim 1, characterized in that, The injection hole (21) includes a large-diameter section (211), a transition section (212), and a small-diameter section (213) that are connected by bending in sequence. The large-diameter section (211) and the small-diameter section (213) extend along the axial direction of the injection hole (21). The large-diameter section (211) and the transition section (212) form the stepped structure. The stepped surface (2121) is located in the transition section (212).

3. The top cover structure according to claim 2, characterized in that, The transition section (212) includes a sealing groove (2122), which is arranged circumferentially along the transition section (212), and the sealing structure (11) is sealed in conjunction with the sealing groove (2122).

4. The top cover structure according to claim 3, characterized in that, The opening direction of the sealing groove (2122) is along the axial direction of the glue injection hole (21).

5. The top cover structure according to claim 3, characterized in that, Both the sealing structure (11) and the sealing groove (2122) are annular structures, and the sealing structure (11) is located inside the sealing groove (2122).

6. The top cover structure according to claim 3, characterized in that, The sealing structure (11) is interference-fitted with the sealing groove (2122).

7. The top cover structure according to claim 3, characterized in that, Both the sealing structure (11) and the sealing groove (2122) include multiple ones, and the sealing structure (11) and the sealing groove (2122) are arranged in a one-to-one correspondence.

8. The top cover structure according to claim 2, characterized in that, The sealing element (10) also includes a sealing sheet (12), the sealing sheet (12) and the sealing structure (11) are an integral structure, and the sealing structure (11) is provided to protrude from the surface of the sealing sheet (12).

9. The top cover structure according to claim 8, characterized in that, The sealing piece (12) is located inside the large diameter section (211), and the peripheral edge of the sealing piece (12) is provided with a gap from the side wall of the large diameter section (211).

10. A battery, characterized in that, The top cover structure includes any one of claims 1 to 9.

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