Welding injection molding battery top cover structure

Abstract

The utility model discloses a welding injection molding battery top cover structure which comprises a base plate and a stop frame arranged below the base plate, and further comprises a pole penetrating through the base plate and the stop frame, and further comprises a welding ring, the welding ring is arranged outside the part, extending out of the base plate, of the pole in a sleeving manner and is fixed on the pole, a sealing interval is formed between the welding ring and the base plate, an injection molding covered edge is arranged outside the pole and the welding ring, and the injection molding covered edge is provided with a part extending to the sealing interval. The top cover is fixed on the pole through the welding ring, and the injection molding wrapping edge is provided with a sealing interval part which extends to the position between the welding ring and the substrate, so that the stability and the safety of the top cover are further improved.

Description

Technical Field

[0001] The utility model relates to the technical field of secondary batteries, in particular to a welded and injection-molded battery top cover structure. Background Art

[0002] With the development of power lithium batteries in China, the technical requirements for battery top covers are strict. Now, the safety requirements for battery cells are getting higher and higher, and the requirements for top covers are also getting higher and higher. In order to improve the stability of the top cover structure, as well as the overall safety and stability of power lithium batteries.

[0003] The existing battery cover plate includes a substrate, a pole column and a stop frame. There is an injection molding edge around the outside of the pole column. Since the pole column is fixed to the substrate and the stop frame through the injection molding edge, the seal between the injection molding edge, the pole column and the substrate is one of the important factors for the stability of the battery top cover structure.

[0004] Therefore, proposing an optimized battery top cover structure to ensure the sealing effect of the pole column, the substrate and the injection molding edge to improve the stability and safety of the battery is one of the current development directions of batteries. Summary of the Utility Model

[0005] In order to solve the technical problems in the background art, the utility model proposes a welded and injection-molded battery top cover structure.

[0006] The welded and injection-molded battery top cover structure proposed by the utility model includes a substrate and a stop frame installed below the substrate, and also includes a pole column passing through the substrate and the stop frame. The pole column has a part extending out of the substrate, and also includes a welding ring. The welding ring is sleeved outside the part of the pole column extending out of the substrate and fixed on the pole column. A sealing interval is formed between the welding ring and the substrate. An injection molding edge is arranged outside the pole column and the welding ring, and the injection molding edge has a part extending to the sealing interval. [[ID=Z4]]

[0007] As a further optimized scheme of the utility model, a stepped opening is formed at one end of the pole column extending out of the substrate. The welding ring is located below the stepped opening, and the injection molding edge has a part located at the stepped opening.

[0008] As a further optimized scheme of the utility model, a second injection molding groove is formed on the outer side surface of the welding ring, and the injection molding edge has a part located at the second injection molding groove.

[0009] As a further optimized scheme of the utility model, a through hole is formed on the substrate. The pole column passes through the through hole, and the diameter of the through hole is larger than the outer diameter of the pole column. The injection molding edge has a part located between the through hole and the outer wall of the pole column.

[0010] As a further optimized solution of the present utility model, a second injection molding groove is formed on the inner wall of the through hole, and a part of the injection molding edge is located in the second injection molding groove.

[0011] As a further optimized solution of the present utility model, it further includes a sealing ring. The lower end of the pole column has an extension part extending radially outward along it. The sealing ring is sleeved outside the pole column, the sealing ring abuts against the substrate, and the lower end of the injection molding edge contacts the sealing ring.

[0012] As a further optimized solution of the present utility model, the outer side surface of the extension part abuts against the stop frame.

[0013] As a further optimized solution of the present utility model, an injection molding hole is formed at one end of the substrate away from the stop frame, and a part of the injection molding edge extends to the injection molding hole.

[0014] In the present utility model, the proposed welded injection-molded battery top cover structure is fixed on the pole column through a welding ring, and the injection molding edge has a part extending to the sealing interval formed between the welding ring and the substrate, further improving the stability and safety of the top cover; during the injection molding process of the injection molding edge, the welding ring is prevented from moving relative to the substrate or the pole column, facilitating processing.

[0015] Additional aspects and advantages of the present utility model will be given in part in the following description, will become apparent in part from the following description, or will be understood through the practice of the present utility model. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic structural diagram of the present utility model;

[0017] Figure 2 is a cross-sectional view of the present utility model;

[0018] Figure 3 is a schematic structural diagram of the welding ring of the present utility model;

[0019] Figure 4 is a partially enlarged view of the substrate of the present utility model;

[0020] In the figure: 1. Substrate; 10. Through hole; 11. Second injection molding groove; 12. Injection molding hole; 2. Stop frame; 3. Pole column; 30. Step opening; 31. Step surface; 32. Extension part; 4. Welding ring; 40. First injection molding groove; 5. Injection molding edge; 6. Sealing interval; 7. Sealing ring. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] Embodiments of the present utility model will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, where the same or similar symbols represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below by referring to the accompanying drawings are exemplary and are only used to explain the present utility model and should not be construed as a limitation to the present utility model.

[0022] As Figures 1 - 4 shown, a welding and injection - molded battery top cover structure includes a substrate 1 and a stop frame 2. The stop frame 2 is installed below the substrate 1. It further includes a pole column 3. After the pole column 3 penetrates through the stop frame 2 and the substrate 1, there is a part extending out of the substrate 1. It also includes a welding ring 4. The welding ring 4 is sleeved outside the pole column 3, fixed on the pole column 3, and located above the substrate 1. Specifically, the welding ring 4 is welded outside the pole column 3 by welding. A sealing gap 6 is formed between the welding ring 4 and the substrate 1. An injection - molded edge 5 is provided outside the pole column 3. The injection - molded edge 5 covers the outside of the pole column 3 and the welding ring 4, and the bottom of the injection - molded edge 5 is connected to the substrate 1 and the injection - molded edge 5 has a part extending into the sealing gap 6.

[0023] Through the welding of the welding ring 4 and the substrate 1 in the present utility model, during the process of processing the injection - molded edge 5 outside the pole column 3, on the one hand, the fixing of the welding ring 4 is realized, and on the other hand, the injection - molded edge 5 has a part extending into the area between the welding ring 4 and the sealing gap 6, which increases the overall stability to a certain extent.

[0024] In some preferred embodiments, a stepped opening 30 is formed at one end of the pole column 3 extending out of the substrate 1. The welding ring 4 is located below the stepped opening 30. And the injection - molded edge 5 has a part located at the stepped opening 30. Preferably, the stepped opening 30 has a stepped surface 31, and the upper end surface of the welding ring 4 is in the same plane as the stepped surface 31.

[0025] In some preferred embodiments, a first injection - molded groove 40 is formed on the outer side surface of the welding ring 4, and the injection - molded edge 5 has a part located in the first injection - molded groove 40, further increasing the stability and safety.

[0026] In some preferred embodiments, the end of the welding ring 4 away from the substrate 1 has a conical outer side surface, and the outer diameter of the end of the welding ring 4 away from the substrate 1 gradually increases from the end away from the substrate 1 to the end close to the substrate 1, further increasing the contact area with the injection - molded edge 5 and enhancing the stability.

[0027] In some preferred embodiments, a through - hole 10 is formed on the substrate 1, the pole column 3 penetrates through the through - hole 10, and the aperture of the through - hole 10 is larger than the outer diameter of the pole column 3. The injection - molded edge 5 has a part located between the inner wall of the through - hole 10 and the outer wall of the pole column 3.

[0028] In order to further increase stability, preferably in some embodiments, a second injection molding groove 11 is formed in the inner wall of the through hole 10. There are a plurality of second injection molding grooves 11, and the plurality of second injection molding grooves 11 are circumferentially distributed along the inner wall of the through hole 10. The injection molding edge 5 has a part located in the second injection molding groove 11.

[0029] Preferably in some embodiments, a sealing ring 7 is further included. The lower end of the pole column 3 is an extension part 32 extending radially outward along it. The sealing ring 7 is sleeved outside the pole column 3, and the sealing ring 7 abuts against the upper end surface of the extension part 32. The lower end of the injection molding edge 5 contacts the sealing ring 7.

[0030] Preferably in some embodiments, the outer side surface of the extension part 32 abuts against the stop frame 2. Specifically, a limiting hole is formed in the lower end surface of the stop frame 2, the outer side surface of the extension part 32 abuts against the inner wall of the limiting hole, and the stop frame 2 has a part that abuts against the upper end surface of the extension part 32. The lower end surface of the sealing ring 7 abuts against the lower end surface of the extension part 32.

[0031] Preferably in some embodiments, an injection molding hole 12 is formed at one end of the substrate 1 away from the stop frame 2, and the injection molding edge 5 has a part extending into the injection molding hole 12. There are a plurality of injection molding holes 12, and the plurality of injection molding holes 12 are circumferentially distributed on the substrate 1 outside the pole column 3 along the circumference of the pole column 3, and an interval is formed between any two adjacent injection molding holes 12.

[0032] It should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0033] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0034] In the present utility model, unless otherwise clearly defined and limited, terms such as "installation", "connection", "attachment", "fixation" and the like shall be construed in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral body; it may be a mechanical connection, an electrical connection or communication with each other; it may be directly connected, or indirectly connected through an intermediate medium, and may be the communication inside two elements or the interaction relationship between two elements, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0035] In the present utility model, unless otherwise clearly defined and limited, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may mean that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "below" and "beneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0036] As mentioned above, it is only the preferred specific embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present utility model, according to the technical solution of the present utility model and its inventive concept, makes equivalent substitutions or changes, and should be covered by the protection scope of the present utility model.

Claims

1. A welding injection battery top cover structure, comprising a substrate (1) and a stopper (2) installed below the substrate (1), and further comprising a pole column (3) passing through the substrate (1) and the stopper (2), characterized in that, The terminal post (3) has a portion extending out of the substrate (1), and further includes a welding ring (4). The welding ring (4) is sleeved outside the portion of the terminal post (3) extending out of the substrate (1) and fixed on the terminal post (3). A sealing gap (6) is formed between the welding ring (4) and the substrate (1). An injection molding edge (5) is provided outside the terminal post (3) and the welding ring (4), and the injection molding edge (5) has a portion extending into the sealing gap (6).

2. The welding and injection-molding battery top cover structure according to claim 1, characterized in that, One end of the terminal post (3) extending out of the substrate (1) is provided with a stepped opening (30). The welding ring (4) is located below the stepped opening (30), and the injection molding edge (5) has a portion located at the stepped opening (30).

3. The welding and injection molding battery top cover structure according to claim 1, characterized in that A second injection molding groove (11) is formed on the outer side surface of the welding ring (4), and the injection molding edge (5) has a portion located at the second injection molding groove (11).

4. The welding and injection-molding battery top cover structure according to claim 1, characterized in that, A through hole (10) is formed on the substrate (1). The terminal post (3) penetrates through the through hole (10), and the diameter of the through hole (10) is larger than the outer diameter of the terminal post (3). The injection molding edge (5) has a portion located between the through hole (10) and the outer wall of the terminal post (3).

5. The welding and injection-molding battery top cover structure according to claim 4, wherein A second injection molding groove (11) is formed on the inner wall of the through hole (10), and the injection molding edge (5) has a portion located in the second injection molding groove (11).

6. The welding and injection-molding battery top cover structure according to claim 1, characterized in that It further includes a sealing ring (7). The lower end of the terminal post (3) has an extension portion (32) extending radially outward. The sealing ring (7) is sleeved outside the terminal post (3) and the sealing ring (7) abuts against the substrate (1). The lower end of the injection molding edge (5) contacts the sealing ring (7).

7. The welding and injection molding battery top cover structure according to claim 6, characterized in that, The outer side surface of the extension portion (32) abuts against the stop bracket (2).

8. The welding and injection molding battery top cover structure according to claim 1, wherein, An injection molding hole (12) is formed at one end of the substrate (1) away from the stop bracket (2), and the injection molding edge (5) has a portion extending into the injection molding hole (12).

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