Cover plate assembly for battery pack, battery pack and vehicle

Abstract

The utility model discloses a cover plate assembly for a battery pack, the battery pack and a vehicle, the cover plate assembly comprises a cover plate main body, and a mounting hole is formed on the cover plate main body. The sealing nail is located in the mounting hole and comprises a first column section and a second column section, the first column section is in interference fit with the mounting hole, the second column section is connected to the side, away from the interior of the battery pack, of the first column section, the outer diameter of the first column section is gradually decreased in the direction away from the second column section, and the outer diameter of the second column section is gradually decreased in the direction away from the second column section. The outer diameter of the second column section is smaller than or equal to the minimum outer diameter of the first column section. And the sealing plate is arranged in the mounting hole, and the sealing plate is propped against the second column section. According to the cover plate assembly for the battery pack, the working reliability of the sealing plate is guaranteed, and the sealing performance of the cover plate assembly for the battery pack is further guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of power batteries, and in particular to a cover plate assembly for a battery pack, a battery pack and a vehicle. Background Art

[0002] In the prior art, a battery cover and its sealing structure include a cover body, a sealing plate, and a sealing pin. The cover body has a through-hole into which the sealing pin, made of rubber, is interference-fitted, and the compression of the sealing pin seals the battery cover. The sealing plate is positioned over the through-hole in the cover body, and the sealing pin is welded to the cover body to protect it from external forces. Due to the interference fit between the sealing pin and the through-hole, the sealing pin is squeezed and deformed, interfering with the sealing plate, thus affecting assembly and welding of the sealing plate. Utility Model Content

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, one object of the present invention is to provide a cover plate assembly for a battery pack. The coordinated arrangement of the first and second column segments ensures the reliability of the sealing plate and further enhances the sealing performance of the cover plate assembly for the battery pack.

[0004] Another object of the present invention is to provide a battery pack comprising the above-mentioned cover plate assembly for a battery pack.

[0005] Another object of the present invention is to provide a vehicle comprising the above-mentioned battery pack.

[0006] According to an embodiment of the first aspect of the present invention, a cover plate assembly for a battery pack includes: a cover plate body, wherein a mounting hole is formed on the cover plate body; a sealing nail, wherein the sealing nail is located in the mounting hole, wherein the sealing nail includes a first column segment and a second column segment, wherein the first column segment is interference-fitted with the mounting hole, the second column segment is connected to a side of the first column segment away from the interior of the battery pack, the outer diameter of the first column segment gradually decreases in a direction away from the second column segment, and the outer diameter of the second column segment is less than or equal to the minimum outer diameter of the first column segment; and a sealing plate, wherein the sealing plate is disposed in the mounting hole and abuts against the second column segment.

[0007] According to the cover plate assembly for a battery pack of the embodiment of the first aspect of the present invention, the working reliability of the sealing plate is ensured through the coordinated arrangement of the first column segment and the second column segment, thereby further ensuring the sealing performance of the cover plate assembly for the battery pack.

[0008] According to some embodiments of the present invention, the outer diameter of the second column segment gradually increases in a direction toward the first column segment.

[0009] According to some embodiments of the present invention, the minimum outer diameter of the first column segment is D1, and the minimum outer diameter of the second column segment is D2, wherein D1 and D2 satisfy: 0.5≤D2 / D1<1.

[0010] According to some embodiments of the present invention, in the radial projection plane of the sealing pin, the angle between the outer surface of the second column segment and the central axis of the sealing pin is α, wherein α satisfies: 0°<α≤10°.

[0011] According to some embodiments of the present invention, the length of the first column segment in the axial direction of the sealing nail is L1, and the length of the second column segment in the axial direction of the sealing nail is L2, wherein L1 and L2 satisfy: L1≥1.2×L2.

[0012] According to some embodiments of the present invention, in the radial projection plane of the sealing pin, the angle between the outer surface of the first column segment and the central axis of the sealing pin is β, wherein β satisfies: 0°<β≤10°.

[0013] According to some embodiments of the present invention, a first step portion and a second step portion are provided in the mounting hole, the inner diameter of the first step portion is larger than the inner diameter of the second step portion, and the sealing plate abuts against the second step portion; the sealing nail also includes a connecting plate, which is connected to the side of the second column segment away from the first column segment, and the connecting plate abuts against the first step portion.

[0014] According to some embodiments of the present invention, the sealing nail also includes a guide column, which is connected to the end of the first column segment away from the connecting plate, and the guide column is located on one side of the thickness direction of the cover plate body; along the direction away from the connecting plate, the outer diameter of the guide column first gradually increases and then gradually decreases.

[0015] A battery pack according to an embodiment of the second aspect of the present invention includes a cover assembly for a battery pack according to an embodiment of the first aspect of the present invention.

[0016] A vehicle according to an embodiment of the third aspect of the present invention includes a battery pack according to an embodiment of the second aspect of the present invention.

[0017] Additional aspects and advantages of the present invention will be given in part in the following description and will become apparent from the following description or learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific implementation methods or the description of the prior art. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0019] Figure 1 is a schematic diagram of a cover assembly for a battery pack according to an embodiment of the present utility model;

[0020] Figure 2 is a schematic diagram of a sealing nail according to an embodiment of the present utility model;

[0021] Figure 3 is a schematic diagram of a sealing nail according to another embodiment of the present utility model;

[0022] Figure 4 is a schematic diagram of a cover plate body according to an embodiment of the present utility model;

[0023] Figure 5 It is a cross-sectional view of a cover assembly for a battery pack according to an embodiment of the present utility model.

[0024] Description of reference numerals:

[0025] 100. Cover assembly for battery pack;

[0026] 1. Cover plate body; 11. Mounting hole; 12. First step portion; 13. Second step portion; 2. Sealing pin; 21. First column section; 22. Second column section; 23. Connecting plate; 24. Guide column; 3. Sealing plate. DETAILED DESCRIPTION

[0027] The embodiments of the present invention are described in detail below. The embodiments described with reference to the accompanying drawings are exemplary. Figure 1-Figure 5 A cover plate assembly 100 for a battery pack according to an embodiment of the first aspect of the present invention is described.

[0028] like Figure 1-Figure 3 As shown, the cover assembly 100 for a battery pack according to the embodiment of the first aspect of the present utility model includes a cover body 1, a sealing pin 2 and a sealing plate 3.

[0029] Specifically, a mounting hole 11 is formed in the cover body 1. A sealing pin 2 is positioned within the mounting hole 11 and comprises a first column segment 21 and a second column segment 22. The first column segment 21 has an interference fit with the mounting hole 11, and the second column segment 22 is connected to the side of the first column segment 21 away from the interior of the battery pack. The outer diameter of the first column segment 21 gradually decreases as it moves away from the second column segment 22, and the outer diameter of the second column segment 22 is less than or equal to the minimum outer diameter of the first column segment 21. A sealing plate 3 is positioned within the mounting hole 11, and the sealing plate 3 abuts against the second column segment 22.

[0030] For example, in Figure 1 In the example, the cover body 1 is roughly a rectangular plate structure, the mounting hole 11 is set near the end of the cover body 1, and the mounting hole 11 is opened along the thickness direction of the cover body 1. The first column section 21 of the sealing nail 2 is interference fit in the mounting hole 11, which strengthens the fit between the sealing nail 2 and the wall of the mounting hole 11 and ensures the sealing effect of the sealing nail 2. The outer diameter of the first column section 21 gradually decreases in the direction away from the second column section 22. This arrangement makes it easier to insert the sealing nail 2 into the mounting hole 11 when installing it, and at the same time, it can better achieve interference fit after insertion, thereby enhancing the sealing effect. Figure 2 As shown, the outer diameter of the second column segment 22 is less than or equal to the minimum outer diameter of the first column segment 21, which will not hinder the installation process. Moreover, when the first column segment 21 is interference-fitted with the mounting hole 11, the first column segment 21 is deformed after being squeezed, which reduces the volume of the first column segment 21, while the second column segment 22 is deformed by internal stress, which increases the volume of the second column segment 22. The outer diameter of the second column segment 22 is less than or equal to the minimum outer diameter of the first column segment 21. Therefore, there is a space for expansion between the outer wall of the second column segment 22 and the hole wall of the mounting hole 11, which prevents the deformation of the sealing pin 2 from affecting the assembly of the sealing plate 3, thereby ensuring the working reliability of the sealing plate 3. At the same time, the setting of the sealing plate 3 further enhances the sealing performance and does not increase the difficulty of installation. It is only necessary to put the sealing plate 3 into the mounting hole 11 and stop it with the second column segment 22.

[0031] Specifically, when assembling the cover assembly 100 for the battery pack, the sealing pin 2 is first assembled in the mounting hole 11 so that the first column section 21 is interference fit in the mounting hole 11, and then the sealing plate 3 is covered on the side of the sealing pin 2 away from the interior of the battery pack.

[0032] According to the cover plate assembly 100 for the battery pack according to the embodiment of the present invention, the working reliability of the sealing plate 3 is ensured by the matching arrangement of the first column section 21 and the second column section 22, and the sealing performance of the cover plate assembly 100 for the battery pack is further ensured.

[0033] It should be noted that the sealing nail 2 is made of rubber material, and those skilled in the art can choose it according to actual needs. The embodiment of the present application does not make any specific limitations here.

[0034] According to some embodiments of the present invention, Figure 3 As shown, the outer diameter of the second column segment 22 gradually increases in the direction toward the first column segment 21. With this arrangement, when installing the sealing nail 2, the end of the second column segment 22 with a larger outer diameter can be used as a guide, making it easier to insert the sealing nail 2 into the mounting hole 11. Moreover, when the first column segment 21 and the mounting hole 11 are interference fit and squeezed, the volume of the second column segment 22 gradually increases due to the internal stress. Since the outer diameter of the second column segment 22 gradually increases in the direction toward the first column segment 21, the contact area between the second column segment 22 and the wall of the mounting hole 11 gradually increases, thereby further enhancing the sealing of the cover assembly 100 for the battery pack. In addition, since the sealing nail 2 adopts a processing method such as mold forming, the outer diameter of the second column segment 22 gradually increases in the direction toward the first column segment 21, which can better adapt to the mold structure and reduce the difficulty of processing.

[0035] According to some specific embodiments of the present invention, the minimum outer diameter of the first column segment 21 is D1, and the minimum outer diameter of the second column segment 22 is D2, wherein D1 and D2 satisfy: 0.5≤D2 / D1<1.

[0036] When D2 / D1 is less than 0.5, the second column segment 22 is too thin compared with the first column segment 21. Therefore, the sealing nail 2 is prone to breakage or failure due to uneven force during use, which is not conducive to the reliability of the sealing nail 2. When D2 / D1 is greater than or equal to 1, the interference fit between the first column segment 21 and the mounting hole 11 may be weakened. The second column segment 22 with a larger outer diameter will generate a reverse force on the first column segment 21 during the installation process, making it difficult for the first column segment 21 to be fully squeezed and deformed to fit tightly with the mounting hole 11, thereby affecting the sealing effect.

[0037] Therefore, the ratio of the minimum outer diameter D1 of the first column section 21 to the minimum outer diameter D2 of the second column section 22 is set within a reasonable range, thereby improving the reliability of the sealing nail 2 and ensuring the sealing effect of the sealing nail 2.

[0038] Furthermore, in the radial projection plane of the sealing nail 2 , the angle between the outer surface of the second column segment 22 and the central axis of the sealing nail 2 is α, wherein α satisfies: 0°<α≤10°.

[0039] When α=0°, the outer diameter of the outer surface of the second column segment 22 is equal at all places. When the second column segment 22 is deformed by force, the deformation space of the second column segment 22 in the mounting hole 11 is small, which may affect the assembly of the sealing plate 3. When α>10°, the angle between the outer surface of the second column segment 22 and the central axis of the sealing pin 2 is too large, which weakens the structural strength of the sealing pin 2 at the second column segment 22. When subjected to external force, the second column segment 22 is more likely to be deformed or damaged, thereby affecting the service life and sealing performance of the entire sealing pin 2, and the fit between the sealing pin 2 and the mounting hole 11 is unstable. When subjected to external force or internal pressure, the sealing pin 2 is prone to displacement or loosening at the second column segment 22, further affecting the sealing performance. Therefore, the angle α between the outer surface of the second column segment 22 and the central axis of the sealing pin 2 is set within 0°<α≤10°, which does not affect the assembly of the sealing plate 3 while enhancing the overall structural stability of the sealing pin 2 and ensuring the sealing performance.

[0040] Furthermore, the length of the first column segment 21 in the axial direction of the sealing pin 2 is L1, and the length of the second column segment 22 in the axial direction of the sealing pin 2 is L2, wherein L1 and L2 satisfy: L1≥1.2×L2.

[0041] When L1 is less than 1.2 × L2, the length of the first column section 21 is relatively short, and the interference fit area between the first column section 21 and the mounting hole 11 is reduced, affecting the sealing effect of the sealing nail 2. When subjected to external forces, the sealing nail 2 is more likely to loosen or shift, further affecting the sealing effect. Therefore, the relationship between the axial length L1 of the first column section 21 and the axial length L2 of the second column section 22 is set within the range of L1 ≥ 1.2 × L2 to ensure the sealing effect of the sealing nail 2.

[0042] According to some embodiments of the present invention, in the radial projection plane of the sealing nail 2 , the angle between the outer surface of the first column segment 21 and the central axis of the sealing nail 2 is β, where β satisfies: 0°<β≤10°.

[0043] When β = 0°, the outer diameter of the outer surface of the first column section 21 is uniform at all locations, increasing the difficulty of installing the sealing pin 2 into the mounting hole 11. When β > 10°, the inclination angle of the outer surface of the first column section 21 is too large. When the first column section 21 is installed in conjunction with the mounting hole 11, the outer surface of the first column section 21 with a smaller outer diameter may not fit into the mounting hole 11, thereby affecting the sealing effect. Furthermore, due to the excessive inclination angle of the outer surface of the first column section 21, the sealing pin 2 cannot be ensured to be installed in the intended position during installation. This may cause the sealing pin 2 to shift during daily use, further affecting the sealing effect.

[0044] Therefore, the included angle β between the outer surface of the first column section 21 and the central axis of the sealing nail 2 is set within 0°<β≤10°, which reduces the difficulty of installing the sealing nail 2 and ensures the sealing effect.

[0045] According to some optional embodiments of the present invention, Figure 4 and Figure 5 As shown, the mounting hole 11 is provided with a first step 12 and a second step 13. The inner diameter of the first step 12 is larger than that of the second step 13, and the sealing plate 3 abuts against the second step 13. The sealing pin 2 also includes a connecting plate 23 connected to the side of the second column section 22 away from the first column section 21, and the connecting plate 23 abuts against the first step 12.

[0046] The arrangement of the first step 12 and the second step 13 ensures a well-sealed area within the mounting hole 11. The sealing plate 3 abuts the second step 13, and the connecting plate 23 abuts the first step 12, effectively preventing gas leakage from the battery pack at these contact points. This improves the overall sealing performance of the battery pack cover assembly 100. Furthermore, the inner diameter of the first step 12 is larger than that of the second step 13, providing ample deformation space for the second column section 22 and further ensuring a good seal. Furthermore, the arrangement of the first step 12 and the second step 13 facilitates the installation of the sealing plate 3 and the sealing pin 2, improving installation efficiency.

[0047] According to some embodiments of the present invention, the sealing nail 2 also includes a guide column 24, which is connected to the end of the first column section 21 away from the connecting plate 23, and the guide column 24 is located on one side of the thickness direction of the cover body 1. In the direction away from the connecting plate 23, the outer diameter of the guide column 24 first gradually increases and then gradually decreases. The provision of the guide column 24 enables the guide column 24 to play a guiding role when installing the sealing nail 2, so that the sealing nail 2 can be accurately inserted into the mounting hole 11, thereby improving the installation efficiency. Moreover, the guide column 24 is located on one side of the thickness direction of the cover body 1, and can cooperate with the sealing plate 3 and the connecting plate 23 to perform a more comprehensive sealing on the mounting hole 11 and enhance the sealing effect. In addition, the outer diameter of the guide column 24 first gradually increases and then gradually decreases. When the sealing nail 2 is installed, the position where the outer diameter of the guide column 24 increases can stop on the cover body 1, further improving the sealing performance.

[0048] The battery pack according to the embodiment of the second aspect of the present invention includes the cover plate assembly 100 for the battery pack according to the embodiment of the first aspect of the present invention.

[0049] According to a battery pack (not shown) of an embodiment of the present invention, by adopting the above-mentioned cover plate assembly 100 for the battery pack, the sealing performance is better, the air pressure inside the battery pack can be kept stable, the reliability of the battery pack is improved, and the maintenance rate is reduced.

[0050] Other structures and operations of the battery pack according to the embodiment of the present invention are known to those skilled in the art and will not be described in detail here.

[0051] A vehicle (not shown) according to an embodiment of the third aspect of the present invention includes a battery pack according to an embodiment of the second aspect of the present invention.

[0052] According to the vehicle of the embodiment of the present invention, by adopting the above-mentioned battery pack, the vehicle's endurance performance and power performance are improved, and the safety risk of the vehicle is reduced.

[0053] Other structures and operations of the vehicle according to the embodiment of the present invention are well known to those skilled in the art and will not be described in detail here.

[0054] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating positions or relationships, are based on the positions or relationships shown in the accompanying drawings and are intended solely to facilitate the description of this utility model and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0055] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0056] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "example," "specific example," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example.

[0057] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and purpose of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A cover assembly for a battery pack, characterized in that: include: a cover plate body, wherein a mounting hole is formed on the cover plate body; a sealing pin, the sealing pin being located in the mounting hole, the sealing pin comprising a first column segment and a second column segment, the first column segment being interference fit with the mounting hole, the second column segment being connected to a side of the first column segment away from the interior of the battery pack, the outer diameter of the first column segment gradually decreasing in a direction away from the second column segment, and the outer diameter of the second column segment being less than or equal to the minimum outer diameter of the first column segment; A sealing plate is disposed in the mounting hole and abuts against the second column segment.

2. The cover plate assembly for a battery pack according to claim 1, wherein: The outer diameter of the second column segment gradually increases in a direction toward the first column segment.

3. The cover plate assembly for a battery pack according to claim 2, wherein: The minimum outer diameter of the first column segment is D1, and the minimum outer diameter of the second column segment is D2, wherein D1 and D2 satisfy: 0.5≤D2 / D1<1.

4. The cover plate assembly for a battery pack according to claim 2, wherein: In the radial projection plane of the sealing pin, the included angle between the outer surface of the second column segment and the central axis of the sealing pin is α, wherein α satisfies: 0°<α≤10°.

5. The cover plate assembly for a battery pack according to claim 1, wherein: The length of the first column segment in the axial direction of the sealing pin is L1, and the length of the second column segment in the axial direction of the sealing pin is L2, wherein L1 and L2 satisfy: L1≥1.2×L2.

6. The cover plate assembly for a battery pack according to claim 5, characterized in that: In the radial projection plane of the sealing pin, the included angle between the outer surface of the first column segment and the central axis of the sealing pin is β, wherein β satisfies: 0°<β≤10°.

7. The cover plate assembly for a battery pack according to any one of claims 1 to 6, characterized in that: A first step portion and a second step portion are provided in the mounting hole, the inner diameter of the first step portion is larger than the inner diameter of the second step portion, and the sealing plate abuts against the second step portion; The sealing nail further includes a connecting plate connected to a side of the second column segment away from the first column segment, and the connecting plate abuts against the first step portion.

8. The cover plate assembly for a battery pack according to claim 7, wherein: The sealing nail further includes a guide post connected to an end of the first post section away from the connecting plate, and the guide post is located on one side of the cover plate body in the thickness direction; Along the direction away from the connecting plate, the outer diameter of the guide column first gradually increases and then gradually decreases.

9. A battery pack, characterized in that: Comprising a cover plate assembly for a battery pack according to any one of claims 1-8.

10. A vehicle, characterized in that: Comprising the battery pack according to claim 9.

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