Battery cover plate structure and square battery

Abstract

The battery cover plate structure comprises a plate body, a pole, upper plastic cement and a sealing ring, a through hole is formed in the plate body, a first turning plate is arranged on the edge of one side of the through hole, and a second turning plate is arranged on the edge of the other side of the through hole; the second turning plate is provided with a first step surface and a second step surface facing the first turning plate, and the second step surface is far away from the first turning plate relative to the first step surface; the pole is arranged in the through hole, and in the axis direction of the through hole, part of the pole coincides with the first step surface; the upper plastic cement is clamped between the plate body and the pole, and the upper plastic cement is propped against the first step surface; the sealing ring is clamped between the plate body and the pole, and the sealing ring is propped against the second turning plate. By arranging the two step surfaces, the sealing ring cannot be excessively pressed by the force applied to the post terminal when the turning plate is spin-riveted, so that the problem of failure caused by crushing the sealing ring is effectively prevented, and the yield of finished products can be ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery cover plate structure and a square battery. Background Art

[0002] In order to adapt to the development needs of new energy, the structure of batteries is constantly being improved. Since electrolyte needs to be injected into the interior of secondary batteries, high requirements are placed on sealing performance to avoid electrolyte leakage, thereby ensuring the stability of battery applications.

[0003] The utility model patent with the existing authorization announcement number CN216850106U discloses a top cover assembly and a battery module, the top cover assembly includes a top cover sheet, a pole and an insulating seal, the top cover sheet is provided with a matching hole and a flange arranged around the matching hole, the pole is inserted into the matching hole, the pole is provided with a mounting convex ring, the insulating seal is sleeved on the pole, the insulating seal is provided with a protrusion that matches the mounting convex ring and a sealing boss spaced from the protrusion. The flange is bent and crimped on the protrusion, and is located between the protrusion and the sealing boss.

[0004] As in the above-mentioned scheme, a bending and flanging process is used to fix the pole, but the pole is pressed on the second insulating sealing part, and the second insulating sealing part is pressed on the installation step. Since a large force needs to be applied to ensure the sealing when riveting and flanging, this structure is prone to crushing the second insulating sealing part during assembly, which will cause the sealing to fail and the structure to be unstable. Utility Model Content

[0005] In view of this, the utility model proposes a battery cover plate structure and a square battery which can effectively avoid damage to the sealing structure caused by assembly, so as to solve the problem that the existing cover plate structure is prone to failure of the sealing structure due to assembly process problems during assembly.

[0006] The technical solution of the utility model is achieved in this way:

[0007] On the one hand, the utility model provides a battery cover structure, including a plate body, a pole, an upper plastic and a sealing ring, wherein:

[0008] A through hole is provided on the plate body, a first flap is provided on one side edge of the through hole, and a second flap is provided on the other side edge;

[0009] The second flap has a first step surface and a second step surface facing the first flap, and the second step surface is farther away from the first flap than the first step surface;

[0010] The pole is arranged in the through hole, and a part of the pole coincides with the first step surface in the axial direction of the through hole;

[0011] The upper plastic clamp is arranged between the plate body and the pole, and the upper plastic abuts against the first step surface;

[0012] The sealing ring is clamped and arranged between the plate body and the pole, and the sealing ring abuts against the second flap.

[0013] On the basis of the above technical solution, preferably, one end of the upper plastic is folded over the first step surface and faces the second step surface;

[0014] A reserved cavity is arranged on the end of the second step surface corresponding to the upper plastic.

[0015] On the basis of the above technical solution, preferably, the pole passes through the through hole, and the circumferential surface of the pole corresponds to the end surfaces of the first flap and the second flap.

[0016] On the basis of the above technical solution, preferably, the plate body, the first flap and the second flap are an integrated structure, the first flap is formed by riveting, and the second flap is formed by stamping.

[0017] On the basis of the above technical solution, preferably, the first flap and the second flap are both annular structures.

[0018] On the basis of the above technical solution, preferably, the first flap includes a first section and a second section which are arranged continuously, wherein:

[0019] The first section is perpendicular to the board surface of the board;

[0020] The second section is perpendicular to the first section and presses the plastic.

[0021] On the basis of the above technical solution, preferably, the difference between the diameter of the first section and the diameter of the pole end face is less than 1.5 mm.

[0022] On the basis of the above technical solution, preferably, the end surface of the pole close to the first flap has a height difference with the plate surface of the plate body less than 2 mm.

[0023] On the basis of the above technical solution, preferably, it further includes a lower plastic and a connecting sheet, wherein:

[0024] The lower plastic is connected to the plate body and the second flap;

[0025] The pole penetrates the lower plastic;

[0026] The connecting piece is electrically connected to the pole.

[0027] On the other hand, the utility model provides a square battery, including the above-mentioned battery cover structure.

[0028] The battery cover structure and square battery of the utility model have the following beneficial effects compared with the prior art:

[0029] (1) By setting a first step surface on the second flap, and the first step surface partially overlaps with the pole, and by setting a second step surface, it is used to contact the sealing ring. In this way, when the first flap is riveted, the force applied to the pole will not excessively press the sealing ring due to the obstruction of the first step surface, thereby effectively preventing the sealing ring from being crushed and causing failure, and ensuring the yield of the finished product;

[0030] (2) By providing a reserved cavity at the position corresponding to the upper plastic on the second step surface, the sealing ring can be fully extended after being pressed and then contact the upper plastic, thereby further improving the sealing performance of the cover plate structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0032] Figure 1 This is an exploded structural diagram of the battery cover of the utility model;

[0033] Figure 2 This is an assembly structure diagram of the battery cover of the utility model;

[0034] Figure 3 This is a schematic diagram of the position of the step surface of the battery cover of the utility model;

[0035] In the figure: 1, plate body; 11, first flap; 111, first section; 112, second section; 12, second flap; 101, through hole; 102, first step surface; 103, second step surface; 104, reserved cavity; 2, pole; 3, upper plastic; 4, sealing ring; 5, lower plastic; 6, connecting piece;

[0036] A. Pole cross-sectional diameter; B. Height difference between the pole end face and the plate body. DETAILED DESCRIPTION

[0037] The following will be combined with the implementation of the utility model to clearly and completely describe the technical solutions in the implementation of the utility model. Obviously, the described implementation is only a part of the implementation of the utility model, not all of the implementations. Based on the implementation of the utility model, all other implementations obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0038] like Figures 1 to 3As shown, the battery cover of the utility model includes a plate body 1, a pole 2, an upper plastic 3, a sealing ring 4, a lower plastic 5 and a connecting piece 6;

[0039] The square battery of the utility model comprises the battery cover plate mentioned above.

[0040] like Figure 1 and Figure 3 As shown, a through hole 101 is provided on the plate body 1, a first flap 11 is provided on one side edge of the through hole 101, and a second flap 12 is provided on the other side edge; the second flap 12 has a first step surface 102 and a second step surface 103 facing the first flap 11, and the second step surface 103 is away from the first flap 11 relative to the first step surface 102; the pole 2 is provided in the through hole 101, and part of the pole 2 overlaps with the first step surface 102 in the axial direction of the through hole 101; the upper plastic 3 is clamped and provided between the plate body 1 and the pole 2, and the upper plastic 3 abuts against the first step surface 102; the sealing ring 4 is clamped and provided between the plate body 1 and the pole 2, and the sealing ring 4 abuts against the second flap 12;

[0041] As in the above structure, before assembly, the first flap 11 in the plate body 1 is completely perpendicular to the plate body 1, and the second flap 12 is stamped and formed, and then the pole 2, the upper plastic 3 and the sealing ring 4 are arranged in the through hole 101, and then the first flap 11 is riveted to press the upper plastic 3 to complete the assembly;

[0042] As described above, when the first flap 11 presses the upper plastic 3, since the upper plastic 3 wraps the pole 2 and the pole 2 partially overlaps with the first step surface 102, the compression limit of the sealing ring 4 is the height difference from the first step surface 102 to the second step surface 103. Therefore, as the pressure gradually increases, due to the limitation of the pole 2 by the first step surface 102, the pole 2 will not exert excessive pressure on the sealing ring 4, so as to avoid crushing the sealing ring 4, thereby ensuring the stability of the structure.

[0043] like Figure 2 As shown, one end of the upper plastic 3 is folded over the first step surface 102 and faces the second step surface 103; the second step surface 103 is provided with a reserved cavity 104 corresponding to the end of the upper plastic 3;

[0044] As shown in the above structure, a reserved cavity 104 is formed between the pole 2 and the second flap 12 due to the thickness limitation of the upper plastic 3. As shown in the figure, the sealing ring 4 and the second flap 12 are partially overlapped. In fact, it is the structure before the sealing ring 4 is assembled. As the first flap 11 is riveted, after the sealing ring 4 is compressed, it will extend to fill the reserved cavity 104, rather than the overlapping structure shown in the figure. At this time, the extended part of the sealing ring 4 will contact the upper plastic 3, thereby fully ensuring the sealing performance.

[0045] like Figure 2As shown, the pole 2 passes through the through hole 101, and the circumference of the pole 2 corresponds to the end surfaces of the first flap 11 and the second flap 12;

[0046] As in the above structure, after the assembly between the components is completed, the end faces of the first flap 11 and the second flap 12 are directed toward the pole 2, which can ensure the compactness of the structure;

[0047] Specifically, the plastic 3 is applied to the clamping portion between the end surface of the first flap 11 and the pole 2 , and the clamping portion between the end surface of the second flap 12 and the pole 2 is sealed.

[0048] The plate body 1, the first flap 11 and the second flap 12 are an integrated structure, the first flap 11 is formed by riveting, and the second flap 12 is formed by stamping;

[0049] Specifically, the plate body 1 , the first flap 11 and the second flap 12 are made of aluminum.

[0050] like Figure 1 As shown, the first flap 11 and the second flap 12 are both annular structures;

[0051] As in the above structure, by adopting the first flap 11 and the second flap 12 of the annular structure, it can be ensured that the upper plastic 3 and the sealing ring 4 have a larger pressing area, thereby ensuring good sealing performance.

[0052] like Figure 2 As shown, the first flap 11 includes a first section 111 and a second section 112 which are arranged continuously, wherein the first section 111 is perpendicular to the board surface of the board body 1; the second section 112 is perpendicular to the first section 111 and presses the upper plastic 3;

[0053] As in the above structure, the first section 111 and the second section 112 are an integrated structure. Before assembly, the first section 111 and the second section 112 are perpendicular to the plate body 1. After the pole 2, the upper plastic 3 and the sealing ring 4 are assembled, the first flap 11 is riveted to form the second section 112 to press the upper plastic 3.

[0054] like Figure 2 As shown, A is the end diameter of the pole, and the difference between the diameter of the first section 111 and the end diameter of the pole 2 is less than 1.5 mm.

[0055] like Figure 2 As shown, the end surface of the pole 2 close to the first flap 11 has a height difference of less than 2 mm from the plate surface of the plate body 1; the distance indicated by the mark B in the specific figure is the above-mentioned height difference.

[0056] like Figure 2 and Figure 3 As shown, the lower plastic 5 is connected to the plate body 1 and the second flap 12; the pole 2 passes through the lower plastic 5; and the connecting piece 6 is electrically connected to the pole 2;

[0057] As in the above structure, the lower plastic 5 is fixedly connected to the plate body 1 and the second flap 12, and is used to connect the battery housing when the batteries are grouped to achieve good sealing performance;

[0058] The connecting piece 6 is used to realize the electrical connection between the pole 2 and the battery cell inside the battery.

[0059] like Figure 1 and Figure 3 As shown, the end of the connecting piece 6 has a groove adapted to the shape of the pole 2 and the lower plastic 5 , so that after the connecting piece 6 is connected to the pole 2 , the connecting piece 6 can fully fit the pole 2 and the lower plastic 5 .

[0060] Specific implementation steps:

[0061] When grouping, the first flap 11 and the second flap 12 on the plate body 1 are pre-formed. At this time, the first flap 11 is not riveted. After the pole 2, the upper plastic 3 and the sealing ring 4 are arranged in the through hole 101, the first flap 11 is riveted to press the upper plastic 3 to achieve sealing. Subsequently, the lower plastic 5 is arranged, and the connecting piece 6 is welded to the lower end face of the pole 2.

[0062] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A battery cover structure, characterized in that: It comprises a plate body (1), a pole (2), an upper plastic (3) and a sealing ring (4), wherein: The plate body (1) is provided with a through hole (101), a first flap (11) is provided on one side edge of the through hole (101), and a second flap (12) is provided on the other side edge; The second flap (12) has a first step surface (102) and a second step surface (103) facing the first flap (11), and the second step surface (103) is farther away from the first flap (11) relative to the first step surface (102); The pole (2) is arranged in the through hole (101), and in the axial direction of the through hole (101), a portion of the pole (2) overlaps with the first step surface (102); The upper plastic (3) is clamped between the plate (1) and the pole (2), and the upper plastic (3) abuts against the first step surface (102); The sealing ring (4) is clamped between the plate body (1) and the pole (2), and the sealing ring (4) abuts against the second flap (12).

2. The battery cover structure according to claim 1, characterized in that: One end of the upper plastic (3) is folded over the first step surface (102) and faces the second step surface (103); The second step surface (103) is provided with a reserved cavity (104) corresponding to the end of the upper plastic (3).

3. The battery cover structure according to claim 1, characterized in that: The pole (2) passes through the through hole (101), and the circumferential surface of the pole (2) corresponds to the end surfaces of the first flap (11) and the second flap (12).

4. The battery cover structure according to claim 1, characterized in that: The plate body (1), the first flap (11) and the second flap (12) are an integrated structure; the first flap (11) is formed by riveting, and the second flap (12) is formed by stamping.

5. The battery cover structure according to claim 1 or 4, characterized in that: The first flap (11) and the second flap (12) are both annular structures.

6. The battery cover structure according to claim 5, characterized in that: The first flap (11) comprises a first section (111) and a second section (112) which are arranged continuously, wherein: The first section (111) is perpendicular to the plate surface of the plate body (1); The second section (112) is perpendicular to the first section (111) and presses the upper plastic (3).

7. The battery cover structure according to claim 6, characterized in that: The difference between the diameter of the first section (111) and the end face diameter of the pole (2) is less than 1.5 mm.

8. The battery cover structure according to claim 1, characterized in that: The pole (2) is close to the end surface of the first flap (11), and the height difference with the plate surface of the plate body (1) is less than 2 mm.

9. The battery cover structure according to claim 1, characterized in that: It also includes a lower plastic (5) and a connecting piece (6), wherein: The lower plastic (5) is connected to the plate body (1) and the second flap (12); The pole (2) passes through the lower plastic (5); The connecting piece (6) is electrically connected to the pole (2).

10. A square battery, characterized in that: It comprises the battery cover structure as claimed in any one of claims 1 to 9.

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