Pole anti-rotation structure, power battery cover plate and power battery

Abstract

The utility model provides a pole anti-rotation structure, a power battery cover plate and a power battery, and the pole anti-rotation structure comprises a cover plate which is provided with a mounting hole; the polar column is arranged in the mounting hole in a penetrating manner, a first anti-rotation part is arranged on the peripheral wall of the upper part of the polar column, and a second anti-rotation part is arranged on the peripheral wall of the lower part of the polar column; the upper plastic part is crimped between the cover plate and the upper part of the pole, the upper plastic part is provided with a third anti-rotation part, and the third anti-rotation part is matched with the first anti-rotation part so as to limit the circumferential rotation of the upper part of the pole; the middle plastic part is connected between the hole wall of the mounting hole and the lower part of the pole in a pressing manner, the middle plastic part is provided with a fourth anti-rotation part, and the fourth anti-rotation part is matched with the second anti-rotation part so as to limit the circumferential rotation of the lower part of the pole. Due to the fact that circumferential rotation of the lower portion of the pole is limited while circumferential rotation of the upper portion of the pole is limited, the torsion resistance of the pole is improved, the pole is not prone to rotating, and the anti-rotation reliability of the pole is improved.

Description

Technical Field

[0001] The present application relates to the technical field of power batteries, and particularly to an anti-rotation structure for a pole column, a power battery cover plate, and a power battery. Background Art

[0002] The power battery cover plate is an important part of the power battery. Currently, the power battery cover plate mainly includes a cover plate, a pole column installed on the cover plate, an upper plastic part, a lower plastic part, and a sealing ring for insulating and sealing the pole column and the cover plate.

[0003] In order to ensure the positioning effect of the pole column, the plastic parts and the cover plate, and prevent rotational displacement between the pole column, the plastic parts and the cover plate, in the existing power battery cover plate, an anti-rotation structure is usually provided between the upper plastic part and the upper part of the pole column. Although it can play a certain anti-rotation role, the anti-rotation reliability is relatively low. Utility Model Content

[0004] The embodiments of the present application provide an anti-rotation structure for a pole column, a power battery cover plate, and a power battery to solve the problems existing in the related technologies. The technical solutions are as follows:

[0005] In a first aspect, the embodiments of the present application provide an anti-rotation structure for a pole column, including:

[0006] A cover plate having an installation hole;

[0007] A pole column passing through the installation hole, with a first anti-rotation part provided on the outer peripheral wall of the upper part of the pole column and a second anti-rotation part provided on the outer peripheral wall of the lower part of the pole column;

[0008] An upper plastic part pressed between the cover plate and the upper part of the pole column, with a third anti-rotation part provided on the upper plastic part. The third anti-rotation part and the first anti-rotation part cooperate to limit the circumferential rotation of the upper part of the pole column;

[0009] A middle plastic part pressed between the hole wall of the installation hole and the lower part of the pole column, with a fourth anti-rotation part provided on the middle plastic part. The fourth anti-rotation part and the second anti-rotation part cooperate to limit the circumferential rotation of the lower part of the pole column.

[0010] In an implementation manner, the first anti-rotation part includes a plurality of anti-rotation grooves arranged at intervals around the axial center line of the pole column;

[0011] The third anti-rotation part includes a plurality of first anti-rotation protrusions arranged around the axial center line of the pole column, and the first anti-rotation protrusions are adapted to the corresponding anti-rotation grooves.

[0012] In one embodiment, the anti-rotation groove extends from the upper end of the upper part of the pole column to the lower end of the upper part of the pole column.

[0013] In one embodiment, the cross-section of the anti-rotation groove gradually increases in a direction away from the axial center line of the pole column.

[0014] In one embodiment, the second anti-rotation part includes at least two anti-rotation plane parts, and the at least two anti-rotation plane parts are arranged at intervals around the axial center line of the pole column;

[0015] The fourth anti-rotation part includes at least two second anti-rotation protrusions, and the at least two second anti-rotation protrusions are arranged at intervals around the axial center line of the pole column, and the second anti-rotation protrusions are adapted to the corresponding anti-rotation plane parts.

[0016] In one embodiment, the outer diameter of the lower part of the pole column is greater than the outer diameter of the upper part of the pole column;

[0017] The middle plastic part covers the outer peripheral wall and the top wall of the lower part of the pole column.

[0018] In one embodiment, the pole column anti-rotation structure further includes:

[0019] A sealing ring, the sealing ring is provided with a first annular part and a second annular part, the second annular part is arranged on the outer peripheral wall of the first annular part and surrounds the first annular part, the first annular part is clamped between the bottom wall of the mounting hole and the bottom of the pole column, and the second annular part is clamped between the bottom of the middle plastic part and the side wall of the mounting hole.

[0020] In one embodiment, the bottom wall of the mounting hole has an annular groove, and the bottom of the first annular part is provided with an annular protrusion, and the annular protrusion is adapted to the annular groove.

[0021] In a second aspect, an embodiment of the present application provides a power battery cover plate, including the above-mentioned pole column anti-rotation structure.

[0022] In a third aspect, an embodiment of the present application provides a power battery, including the above-mentioned pole column anti-rotation structure.

[0023] The advantages or beneficial effects in the above technical solutions at least include:

[0024] The anti-rotation structure of the pole column of the present utility model is provided with a first anti-rotation portion on the outer peripheral wall of the upper part of the pole column and a third anti-rotation portion on the upper plastic part. The cooperation between the third anti-rotation portion and the first anti-rotation portion can increase the bonding force between the upper plastic part and the upper part of the pole column, and can limit the circumferential rotation of the upper part of the pole column. At the same time, a second anti-rotation portion is provided on the outer peripheral wall of the lower part of the pole column and a fourth anti-rotation portion is provided on the middle plastic part. The cooperation between the fourth anti-rotation portion and the second anti-rotation portion can increase the bonding force between the middle plastic part and the lower part of the pole column, and can limit the circumferential rotation of the lower part of the pole column. Among them, since the circumferential rotation of the upper part of the pole column is restricted while the circumferential rotation of the lower part of the pole column is also restricted, the anti-torsion performance of the pole column is increased, making the pole column less likely to rotate, and improving the anti-rotation reliability of the pole column.

[0025] The above summary is only for the purpose of the specification and is not intended to be limiting in any way. In addition to the illustrative aspects, embodiments and features described above, further aspects, embodiments and features of the present application will be readily apparent by reference to the drawings and the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In the drawings, unless otherwise specified, the same reference numerals throughout the several views denote the same or similar components or elements. These drawings are not necessarily drawn to scale. It should be understood that these drawings only depict some embodiments disclosed in the present application and should not be regarded as limiting the scope of the present application.

[0027] Figure 1 is a cross-sectional view of the anti-rotation structure of the pole column of the present utility model;

[0028] Figure 2 is Figure 1 a partial enlarged view of part A in

[0029] Figure 3 is a three-dimensional structural schematic diagram of the pole column of the present utility model from a first perspective;

[0030] Figure 4 is a three-dimensional structural schematic diagram of the pole column of the present utility model from a second perspective.

[0031] REFERENCE NUMERALS

[0032] 1. Cover plate; 11. Mounting hole; 12. Annular groove; 13. Bending portion; 2. Pole column; 21. First anti-rotation portion; 211. Anti-rotation groove; 22. Second anti-rotation portion; 221. Anti-rotation flat portion; 3. Upper plastic part; 4. Middle plastic part; 5. Sealing ring; 51. First annular portion; 52. Second annular portion; 6. Lower plastic part; 61. Connecting portion. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0033] In the following text, only some exemplary embodiments are simply described. As those skilled in the art can recognize, the described embodiments can be modified in various different ways without departing from the spirit or scope of the present application. Therefore, the drawings and the description are considered to be exemplary in nature rather than restrictive.

[0034] Refer to Figures 1-4 , which shows an anti-rotation structure for a terminal post according to a preferred embodiment of the present invention, including:

[0035] A cover plate 1, the cover plate 1 having a mounting hole 11;

[0036] A terminal post 2, the terminal post 2 passing through the mounting hole 11, a first anti-rotation portion 21 being provided on the outer peripheral wall of the upper portion of the terminal post 2, and a second anti-rotation portion 22 being provided on the outer peripheral wall of the lower portion of the terminal post 2;

[0037] An upper plastic part 3, the upper plastic part 3 being crimped between the cover plate 1 and the upper portion of the terminal post 2, a third anti-rotation portion (not shown in the figure) being provided on the upper plastic part 3, the third anti-rotation portion cooperating with the first anti-rotation portion 21 to limit the circumferential rotation of the upper portion of the terminal post 2;

[0038] A middle plastic part 4, the middle plastic part 4 being crimped between the hole wall of the mounting hole 11 and the lower portion of the terminal post 2, a fourth anti-rotation portion (not shown in the figure) being provided on the middle plastic part 4, the fourth anti-rotation portion cooperating with the second anti-rotation portion 22 to limit the circumferential rotation of the lower portion of the terminal post 2.

[0039] For the anti-rotation structure of the terminal post of the present invention, by providing the first anti-rotation portion 21 on the outer peripheral wall of the upper portion of the terminal post 2 and the third anti-rotation portion on the upper plastic part 3, and the third anti-rotation portion cooperating with the first anti-rotation portion 21, the bonding force between the upper plastic part 3 and the upper portion of the terminal post 2 can be increased, and the circumferential rotation of the upper portion of the terminal post 2 can be restricted. At the same time, by providing the second anti-rotation portion 22 on the outer peripheral wall of the lower portion of the terminal post 2 and the fourth anti-rotation portion on the middle plastic part 4, and the fourth anti-rotation portion cooperating with the second anti-rotation portion 22, the bonding force between the middle plastic part 4 and the lower portion of the terminal post 2 can be increased, and the circumferential rotation of the lower portion of the terminal post 2 can be restricted. Among them, since the circumferential rotation of the upper portion of the terminal post 2 is restricted while the circumferential rotation of the lower portion of the terminal post 2 is also restricted, the torsional resistance of the terminal post 2 is increased, making the terminal post 2 less likely to rotate, and improving the anti-rotation reliability of the terminal post 2.

[0040] Refer to Figure 3 and Figure 4 , in one embodiment, the first anti-rotation portion 21 includes a plurality of anti-rotation grooves 211, and the plurality of anti-rotation grooves 211 are arranged at intervals around the axial center line of the terminal post 2;

[0041] The third anti-rotation part includes a plurality of first anti-rotation protrusions. The plurality of first anti-rotation protrusions are arranged around the axial center line of the pole column 2. The first anti-rotation protrusion is adapted to the corresponding anti-rotation groove 211 to reliably limit the circumferential rotation of the upper part of the pole column 2, which is beneficial to improving the assembly stability of the pole column 2.

[0042] Of course, in other embodiments, the first anti-rotation part 21 may include a plurality of first anti-rotation protrusions, and the third anti-rotation part may include a plurality of anti-rotation grooves 211.

[0043] See Figure 4 , in one embodiment, the anti-rotation groove 211 extends from the upper end of the upper part of the pole column 2 to the lower end of the upper part of the pole column 2, so as to increase the axial dimension of the anti-rotation groove 211, thereby increasing the contact area between the anti-rotation groove 211 and the first anti-rotation protrusion, so as to more reliably limit the circumferential rotation of the upper part of the pole column 2 and further improve the assembly stability of the pole column 2.

[0044] See Figures 3-4 , in one embodiment, the cross-section of the anti-rotation groove 211 gradually increases in a direction away from the axial center line of the pole column 2, so as to increase the radial dimension of the anti-rotation groove 211, thereby increasing the contact area between the anti-rotation groove 211 and the first anti-rotation protrusion, so as to more reliably limit the circumferential rotation of the upper part of the pole column 2 and further improve the assembly stability of the pole column 2.

[0045] See Figures 3-4 , in one embodiment, the second anti-rotation part 22 includes at least two anti-rotation flat parts 221. The at least two anti-rotation flat parts 221 are arranged at intervals around the axial center line of the pole column 2;

[0046] The fourth anti-rotation part includes at least two second anti-rotation protrusions. The at least two second anti-rotation protrusion parts are arranged at intervals around the axial center line of the pole column 2. The second anti-rotation protrusion is adapted to the corresponding anti-rotation flat part 221 to reliably limit the circumferential rotation of the lower part of the pole column 2, which is beneficial to improving the assembly stability of the pole column 2.

[0047] Of course, in other embodiments, the second anti-rotation part 22 may also include a plurality of grooves. The plurality of grooves are arranged at intervals around the axial center line of the pole column 2. Correspondingly, the fourth anti-rotation part may also include a plurality of protrusions. The plurality of protrusions are arranged at intervals around the axial center line of the pole column 2. The protrusion is adapted to the corresponding groove, and can also reliably limit the circumferential rotation of the lower part of the pole column 2, which is beneficial to improving the assembly stability of the pole column 2.

[0048] See Figure 2 and Figure 4 , in one embodiment, the outer diameter of the lower part of the pole column 2 is larger than the outer diameter of the upper part of the pole column 2;

[0049] The middle plastic part 4 covers the outer peripheral wall and the top wall of the lower part of the terminal post 2, so as to increase the contact area between the middle plastic part 4 and the lower part of the terminal post 2, thereby increasing the bonding force between the cover plate 1 and the terminal post 2 and facilitating further improvement of the assembly stability of the terminal post 2.

[0050] See Figure 2 , in an embodiment, the anti-rotation structure of the terminal post further includes:

[0051] A sealing ring 5, the sealing ring 5 is provided with a first annular part 51 and a second annular part 52, the second annular part 52 is arranged on the outer peripheral wall of the first annular part 51 and surrounds the first annular part 51, the first annular part 51 is clamped between the bottom wall of the mounting hole 11 and the bottom of the terminal post 2, and the second annular part 52 is clamped between the bottom of the middle plastic part 4 and the side wall of the mounting hole 11. Since the upper plastic part 3 is crimped between the cover plate 1 and the upper part of the terminal post 2, at the same time, the first annular part 51 is clamped between the bottom wall of the mounting hole 11 and the bottom of the terminal post 2 to limit the axial movement of the terminal post 2, thereby realizing the insulating fixation of the terminal post 2. There is no need to form a terminal post ring or weld the terminal post 2, and the assembly process is less, which can effectively improve the assembly efficiency. At the same time, the gap between the cover plate 1 and the terminal post 2 can be reliably sealed by using the sealing ring 5, which is beneficial to improving the airtightness of the anti-rotation structure of the terminal post.

[0052] In an embodiment, a first groove is formed between the top of the second annular part 52 and the upper outer peripheral wall of the first annular part 51, and a second groove is formed between the bottom of the second annular part 52 and the lower outer peripheral wall of the first annular part 51, which can play a role in thinning the second annular part 52, realizing the reduction of the compression difficulty of the second annular part 52, making the second annular part 52 reliably clamped between the side wall of the mounting hole 11 and the bottom of the middle plastic part 4, ensuring that the second annular part 52 is in close contact with the side wall of the mounting hole 11 and the second annular part 52 is in close contact with the bottom of the middle plastic part 4, thereby reliably sealing the gap between the terminal post 2 and the cover plate 1 and avoiding problems such as incomplete compression of the sealing ring 5, deviation of the sealing ring 5, and air leakage, improving the sealing reliability; in addition, a second groove is formed between the bottom of the second annular part 52 and the lower outer peripheral wall of the first annular part 51, which can play a role in avoiding the sealing ring 5 and the cover plate 1 and avoiding the assembly interference problem between the sealing ring 5 and the top cover plate 1.

[0053] See Figure 2 , in an embodiment, the bottom wall of the mounting hole 11 has an annular groove 12, and the bottom of the first annular part 51 is provided with an annular protrusion (not shown in the figure), and the annular protrusion and the annular groove 12 are adapted to increase the contact area between the sealing ring 5 and the hole wall of the mounting hole 11, and further improve the airtightness of the anti-rotation structure of the terminal post.

[0054] In one embodiment, a bending portion 13 is provided at the top of the cover plate 1. The bending portion 13 is arranged around the top opening of the mounting hole 11, and the bending portion 13 bends towards the axial center line of the mounting hole 11. The upper plastic part 3 covers the bending portion 13 to increase the contact area between the upper plastic part 3 and the pole column 2, which is beneficial to further improve the assembly stability of the pole column 2.

[0055] In one embodiment, the number of the bending portions 13 is multiple. The multiple bending portions 13 are arranged at intervals around the axial center line of the mounting hole 11, so that a part of the upper plastic part 3 is filled between the adjacent bending portions 13, which can reliably fix the upper plastic part 3 on the cover plate 1. At the same time, it is beneficial to further improve the assembly stability of the pole column 2.

[0056] See Figures 1-2 , in one embodiment, the pole column anti-rotation structure further includes:

[0057] A lower plastic part 6, the lower plastic part 6 covers the bottom of the cover plate 1, and the lower plastic part 6 is provided with a connecting portion 61. The connecting portion 61 is inserted into the bottom opening of the mounting hole 11, and the connecting portion 61 is arranged around the axial center line of the mounting hole 11. Since the connecting portion 61 is inserted into the bottom opening of the mounting hole 11, the contact area between the lower plastic part 6 and the cover plate 1 can be increased, so that the lower plastic part 6 and the cover plate 1 are reliably assembled together. At the same time, the lower plastic part 6 plays an insulating role.

[0058] A preferred embodiment of the present invention provides a power battery cover plate 1, including the above-mentioned pole column anti-rotation structure.

[0059] For the power battery cover plate of the present invention, due to the adoption of the above-mentioned pole column anti-rotation structure, and also because it restricts the circumferential rotation of the upper part of the pole column 2 while restricting the circumferential rotation of the lower part of the pole column 2, the torsional resistance of the pole column 2 is increased, making the pole column 2 less likely to rotate, and improving the anti-rotation reliability of the pole column 2.

[0060] A preferred embodiment of the present invention provides a power battery, including the above-mentioned pole column anti-rotation structure.

[0061] For the power battery of the present invention, due to the adoption of the above-mentioned pole column anti-rotation structure, and also because it restricts the circumferential rotation of the upper part of the pole column 2 while restricting the circumferential rotation of the lower part of the pole column 2, the torsional resistance of the pole column 2 is increased, making the pole column 2 less likely to rotate, and improving the anti-rotation reliability of the pole column 2.

[0062] In the description of this specification, the descriptions referring to terms such as "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. Moreover, the specific features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0063] 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 application, "a plurality of" means two or more unless otherwise specifically defined.

[0064] The above is only the specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art within the technical scope disclosed in the present application can easily think of various changes or substitutions, and these should all be covered by the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. The anti-rotation structure of the terminal post, characterized in that Comprising: A cover plate having a mounting hole; A pole post passing through the mounting hole, with a first anti-rotation portion provided on the outer peripheral wall of the upper part of the pole post and a second anti-rotation portion provided on the outer peripheral wall of the lower part of the pole post; An upper plastic part crimped between the cover plate and the upper part of the pole post, with a third anti-rotation portion provided on the upper plastic part, and the third anti-rotation portion cooperating with the first anti-rotation portion to limit the circumferential rotation of the upper part of the pole post; A middle plastic part crimped between the hole wall of the mounting hole and the lower part of the pole post, with a fourth anti-rotation portion provided on the middle plastic part, and the fourth anti-rotation portion cooperating with the second anti-rotation portion to limit the circumferential rotation of the lower part of the pole post.

2. The anti-rotation structure of the terminal post according to claim 1, characterized in that, The first anti-rotation portion includes a plurality of anti-rotation grooves arranged at intervals around the axial center line of the pole post; The third anti-rotation portion includes a plurality of first anti-rotation protrusions arranged around the axial center line of the pole post, and the first anti-rotation protrusions are adapted to the corresponding anti-rotation grooves.

3. The anti-rotation structure of the terminal post according to claim 2, characterized in that, The anti-rotation grooves extend from the upper end of the upper part of the pole post to the lower end of the upper part of the pole post.

4. The anti-rotation structure of the terminal post according to claim 2, wherein The cross-section of the anti-rotation groove gradually increases in a direction away from the axial center line of the pole post.

5. The anti-rotation structure of the terminal post according to claim 1, characterized in that, The second anti-rotation portion includes at least two anti-rotation flat portions arranged at intervals around the axial center line of the pole post; The fourth anti-rotation portion includes at least two second anti-rotation protrusions arranged at intervals around the axial center line of the pole post, and the second anti-rotation protrusions are adapted to the corresponding anti-rotation flat portions.

6. The anti-rotation structure of the terminal post according to claim 1, wherein The outer diameter of the lower part of the pole post is larger than the outer diameter of the upper part of the pole post; The middle plastic part covers the outer peripheral wall and the top wall of the lower part of the pole post.

7. The anti-rotation structure of the terminal post according to claim 1, wherein The pole post anti-rotation structure further includes: A sealing ring having a first annular portion and a second annular portion, the second annular portion being provided on the outer peripheral wall of the first annular portion and surrounding the first annular portion, the first annular portion being clamped between the bottom wall of the mounting hole and the bottom of the pole post, and the second annular portion being clamped between the bottom of the middle plastic part and the side wall of the mounting hole.

8. The anti-rotation structure of the terminal post according to claim 7, wherein The bottom wall of the mounting hole has an annular groove, and the bottom of the first annular portion is provided with an annular protrusion, and the annular protrusion is adapted to the annular groove.

9. Power battery cover plate, characterized in that Comprising the pole post anti-rotation structure according to any one of claims 1-8.

10. Power battery, characterized in that, Comprising the pole post anti-rotation structure according to any one of claims 1-8.

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