Stable secondary battery top cover

Abstract

The utility model discloses a stable secondary battery top cover which comprises a cover plate and a stop frame installed at the bottom of the cover plate, an upper through hole is formed in the cover plate, a lower through hole communicated with the upper through hole is formed in the stop frame, a gasket is arranged on the cover plate, a sealing piece is arranged in the upper through hole, and the stable secondary battery top cover further comprises a pole column. The pole penetrates through the gasket and the sealing element; the lithium ion battery further comprises a pole piece which abuts against the lower end face of the sealing piece and is connected with the lower end face of the pole column. The stable secondary battery top cover provided by the utility model is simple in structure, the pole piece abuts against the sealing piece and is welded with the pole column, so that the pole column and the pole piece are relatively positioned, the pole column and the pole piece are positioned relative to the cover plate and the stop frame, and the assembly efficiency is improved on the premise of ensuring the stability.

Description

Technical Field

[0001] This utility model relates to the field of lithium battery technology, and in particular to a stable secondary battery top cover. Background Technology

[0002] With the development of power lithium batteries in my country, the safety requirements for battery cells are becoming increasingly stringent, leading to higher demands on battery top covers. The demand for lithium batteries is also relatively high. Therefore, increasing battery production efficiency while ensuring cell stability and safety has become a current research focus. Current battery top covers consist of terminals and electrode plates installed below them. During installation, the terminals are first fixed to the top of the cover plate, and then the electrode plates are fixed to the lower end of the terminals, reducing assembly time to some extent. Utility Model Content

[0003] To address the technical problems existing in the background art, this utility model proposes a stable secondary battery top cover.

[0004] This utility model proposes a stable secondary battery top cover, including a cover plate and a stop bracket installed at the bottom of the cover plate. The cover plate has an upper through hole, and the stop bracket has a lower through hole communicating with the upper through hole. The cover plate is provided with a gasket, and a sealing element is provided in the upper through hole. It also includes an electrode post, which passes through the gasket and the sealing element.

[0005] It also includes an electrode plate, which abuts against the lower end face of the seal and is connected to the lower end face of the pole.

[0006] During installation, the electrode post is first inserted through the central hole and upper through hole of the gasket, and then the sealing element is installed to position the axis of the electrode post. Then, the electrode plate is pressed against the sealing element and welded to the electrode post to achieve the relative positioning of the electrode post and the electrode plate. At the same time, the positioning of the electrode post and the electrode plate relative to the cover plate and the stop bracket is also achieved, which increases the assembly efficiency while ensuring stability.

[0007] As a further optimization of this utility model, the electrode and the electrode post are fixed by through welding.

[0008] As a further optimization of this utility model, the cover plate has an upper positioning groove on the side opposite to the stop frame, the upper through hole is opened in the upper positioning groove, and the stop frame has a protrusion that extends into the upper positioning groove.

[0009] As a further optimization of this utility model, the sealing element has an extension that abuts against the upper positioning groove.

[0010] As a further optimization of this utility model, a deformation gap is formed between the sealing element and the lower through hole, an annular gap is formed between the upper positioning groove and the side of the protrusion, and a connecting hole is opened on the protrusion to connect the deformation gap and the annular gap.

[0011] As a further optimization of this utility model, the inner diameter of the gasket is smaller than the inner diameter of the upper through hole and larger than the inner diameter of the seal.

[0012] As a further optimization of this utility model, there is an axial gap between the seal and the gasket along the axis of the pole post.

[0013] As a further optimization of this utility model, the stop bracket has a lower positioning groove on the side away from the cover plate, the lower through hole is opened in the lower positioning groove, and the electrode plate matches the lower positioning groove.

[0014] As a further optimization of this utility model, the electrode has a portion extending out of the lower positioning groove.

[0015] As a further optimization of this utility model, the stop bracket has an assembly ring groove, and the lower positioning groove is formed in the lower positioning groove.

[0016] As a further optimization of this utility model, the washer has a limiting ring groove, and the pole has an outer extension that matches the limiting ring groove, thereby further increasing the overall stability.

[0017] As a further optimization of this utility model, the cover plate has an explosion-proof hole, and an explosion-proof valve is installed inside the explosion-proof hole. The stop frame has an explosion-proof frame, and there is an explosion-proof gap between the explosion-proof frame and the explosion-proof valve. The cover plate has an upper injection hole, and the stop frame has a lower injection hole that communicates with the upper injection hole. A sealing nail is installed inside the upper injection hole, and a connecting part is provided between the lower injection hole and the explosion-proof gap. The connecting part connects the explosion-proof gap and the lower injection hole, which increases the injection effect and further enhances the explosion-proof performance.

[0018] The proposed stable secondary battery top cover has a simple structure. By pressing the electrode against the sealing element and welding the electrode to the terminal post, the relative positioning of the terminal post and electrode is achieved. At the same time, the positioning of the terminal post and electrode relative to the cover plate and the stop frame is also achieved, which increases the assembly efficiency while ensuring stability.

[0019] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0020] Figure 1This is a schematic diagram of the structure of this utility model;

[0021] Figure 2 This is a partial cross-sectional view of the welding of the electrode post and electrode sheet of this utility model;

[0022] Figure 3 This is a partial cross-sectional view of the explosion-proof hole portion of this utility model;

[0023] In the diagram: 1. Cover plate; 10. Upper through hole; 11. Upper positioning groove; 12. Explosion-proof hole; 13. Upper injection hole; 2. Stop bracket; 20. Lower through hole; 21. Protrusion; 22. Lower positioning groove; 23. Assembly ring groove; 24. Lower injection hole; 3. Seal; 4. Pole post; 5. Pole plate; 50. Welding ring groove; 6. Explosion-proof valve; 7. Explosion-proof patch; 8. Sealing nail; 9. Washer; 90. Limiting ring groove; 14. Connecting part. Detailed Implementation

[0024] The embodiments of this utility model are described in detail below. Examples of these embodiments are illustrated in the accompanying drawings, wherein the same or similar symbols denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0025] like Figures 1-3 The illustration shows a stable secondary battery top cover, including a cover plate 1 and a stop frame 2 installed at the bottom of the cover plate 1. The stop frame 2 is made of insulating material. The cover plate 1 has an upper through hole 10, and the stop frame 2 has a lower through hole 20 communicating with the upper through hole 10. The cover plate 1 is provided with a gasket 9, and the upper through hole 10 is provided with a sealing element 3. The cover plate 1 also includes an electrode post 4, which passes through the gasket 9 and the sealing element 3.

[0026] It also includes an electrode 5, which abuts against the lower end face of the seal 3 and is connected to the lower end face of the pole post 4.

[0027] In this embodiment, two sets of upper through holes 10 and lower through holes 20 are respectively provided. One set of upper through holes 10 is opposite to one set of lower through holes 20. The sealing element 3, the pole post 4, the electrode plate 5, and the pole post 4 are all provided in two sets. One set of electrode plate 5 is a positive electrode plate 5, and one set of electrode plate 5 is a negative electrode plate 5. One set of pole post 4 is a negative pole post 4, and one set of pole post 4 is a positive pole post 4. One set of gaskets 9 is a positive weak conductive insulating gasket 9, and the other set of gaskets 9 is a negative insulating gasket 9. The positive electrode plate 5, the positive pole post 4, the positive weak conductive insulating gasket 9, and the sealing element 3 are installed in one set of upper through holes 10 and lower through holes 20. The negative pole post 4, the negative electrode plate 5, the negative insulating gasket 9, and the sealing element 3 are installed in the other set of upper through holes 10 and lower through holes 20.

[0028] During installation, the pole post 4 is first passed through the middle hole of the washer 9 and the upper through hole 10. Then, the sealing element 3 is installed to position the axis of the pole post 4. Then, the pole piece 5 is pressed against the sealing element 3 and welded to the pole post 4 to achieve the relative positioning of the pole post 4 and the pole piece 5. At the same time, the pole post 4 and the pole piece 5 are positioned relative to the cover plate 1 and the stop frame 2, which increases the assembly efficiency while ensuring stability.

[0029] Preferably, the electrode 5 and the electrode post 4 are fixed by through welding. To facilitate welding of the electrode 5 and the electrode post 4, a welding annular groove 50 is opened at the bottom of the electrode 5.

[0030] Preferably, the cover plate 1 and the stop frame 2 have an upper positioning groove 11 on their opposite sides, and an upper through hole 10 is opened in the upper positioning groove 11. The stop frame 2 has a protrusion 21 that extends into the upper positioning groove 11, thereby further realizing the relative positioning of the stop frame 2 and the cover plate 1.

[0031] Preferably, the seal 3 has an extension that abuts against the upper positioning groove 11, further increasing the insulation and sealing effect of the seal 3.

[0032] Preferably, a deformation gap is formed between the seal 3 and the lower through hole 20, and an annular gap is formed between the upper positioning groove 11 and the side of the protrusion 21. A connecting hole is opened on the protrusion 21 to connect the annular gap of the deformation gap. When the electrode 5 is pressed, the seal 3 is squeezed and deformed to avoid the deformation size of the seal 3 being affected by the large pressure of the deformation gap, and to further increase the overall stability.

[0033] Preferably, the inner diameter of the gasket 9 is smaller than the inner diameter of the upper through hole 10 but larger than the inner diameter of the seal 3. When installing the pole post 4, the pole post 4 can be initially positioned by fitting it into the gasket 9, and then the seal 3 can be installed to achieve precise positioning of the pole post 4. This facilitates the installation and positioning of the pole post 4 and ensures the accuracy of the pole post 4's positioning.

[0034] Preferably, there is an axial gap between the seal 3 and the gasket 9 along the axis of the pole post 4.

[0035] Preferably, the stop bracket 2 has a lower positioning groove 22 on the side away from the cover plate 1, and the lower through hole 20 is opened in the lower positioning groove 22. The electrode 5 matches the lower positioning groove 22, which further increases the accuracy of the positioning of the electrode 5.

[0036] Preferably, the electrode 5 has a portion extending beyond the lower positioning groove 22, further increasing the overall stability.

[0037] Preferably, the stop frame 2 has an assembly ring groove 23, and the lower positioning groove 22 is opened in the assembly ring groove 23. When the electrode plate 5 is welded, the electrode plate 5 is pressed against by the auxiliary part that presses against the electrode plate 5, and the auxiliary part has an assembly protrusion that matches the assembly ring groove 23 to further increase the stability of pressing against the electrode post 4.

[0038] Preferably, the washer 9 has a limiting ring groove 90, and the pole post 4 has an outer extension that matches the limiting ring groove 90, further increasing the overall stability.

[0039] like Figure 3 In some preferred embodiments, the cover plate 1 has an explosion-proof hole 12, an explosion-proof valve 6 is provided inside the explosion-proof hole 12, the stop frame 2 has an explosion-proof frame, the explosion-proof frame and the explosion-proof valve 6 are separated by an explosion-proof gap, an explosion-proof patch 7 is attached to the top of the explosion-proof hole, the cover plate 1 has an upper injection hole 13, the stop frame 2 has a lower injection hole 24 communicating with the upper injection hole 13, a sealing nail 8 is provided inside the upper injection hole 13, and a connecting part 14 is provided between the lower injection hole 24 and the explosion-proof gap. The connecting part 14 connects the lower injection hole 24 of the explosion-proof gap, which increases the injection effect and further increases the explosion-proof performance.

[0040] It should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0041] Furthermore, 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 indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0042] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0043] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0044] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A stable top cover for a secondary battery comprising a cover plate (1) and a stopper frame (2) mounted on the bottom of said cover plate (1), characterized in that, The cover plate (1) is provided with an upper through hole (10), the stop frame (2) is provided with a lower through hole (20) communicated with the upper through hole (10), the cover plate (1) is provided with a gasket (9), the upper through hole (10) is provided with a sealing element (3), and the pole post (4) penetrates the gasket (9) and the sealing element (3). The pole piece (5) is in contact with the lower end surface of the sealing element (3) and is connected with the lower end surface of the pole post (4).

2. The stable top cover for a secondary battery according to claim 1, characterized by The pole piece (5) and the pole post (4) are fixed by means of penetration welding.

3. The stable top cover for a secondary battery of claim 1, wherein The cover plate (1) is provided with an upper positioning groove (11) on the opposite side of the stop frame (2), the upper through hole (10) is arranged in the upper positioning groove (11), and the stop frame (2) is provided with a protruding portion (21) extending into the upper positioning groove (11).

4. The stable top cover for a secondary battery of claim 3, wherein The sealing element (3) has an extension part in contact with the upper positioning groove (11).

5. The stable top cover for a secondary battery of claim 3, wherein The sealing element (3) and the lower through hole (20) form a deformation interval, the upper positioning groove (11) and the side surface of the protruding portion (21) form an annular gap, and the protruding portion (21) is provided with a communication hole communicating the deformation interval and the annular gap.

6. The stable top cover for a secondary battery of claim 1, wherein The inner diameter of the gasket (9) is smaller than the inner diameter of the upper through hole (10) and larger than the inner diameter of the sealing element (3).

7. The stable top cover for a secondary battery of claim 1, wherein The sealing element (3) and the gasket (9) have an axial interval along the axis of the pole post (4).

8. The stable top cover for a secondary battery of claim 1, wherein The stop frame (2) is provided with a lower positioning groove (22) on the side away from the cover plate (1), the lower through hole (20) is arranged in the lower positioning groove (22), and the pole piece (5) is matched with the lower positioning groove (22).

9. The stable top cover for a secondary battery of claim 8, wherein, The pole piece (5) has a part extending out of the lower positioning groove (22).

10. The stable top cover for a secondary battery of claim 8, wherein The stop frame (2) is provided with an assembly ring groove (23), and the lower positioning groove (22) is arranged in the lower positioning groove (22).

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