Sealing element and battery

Abstract

The utility model provides a sealing element and battery, wherein the sealing element comprises a sealing main body part and a sealing compensation part connected to the outer side of the sealing compensation part, the sealing main body part is used for being installed on a top cover, and at least part of the sealing compensation part is configured to be bent towards the top cover. According to the sealing element provided by the utility model, when the sealing compensation part is pulled by the sealing main body part due to deformation, the bending part of the sealing compensation part deforms in the pulling direction of the sealing compensation part, so that the stress generated by the sealing main body part to the sealing compensation part is released in time, and the risk that the sealing element is cracked or fractured is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to a battery field, concretely relates to a sealing element and battery. BACKGROUND

[0002] When the operation of injecting electrolyte into the battery is completed, the sealing element is usually welded to the cover plate of the battery, and the liquid injection hole provided on the cover plate is sealed to prevent the electrolyte from overflowing from the liquid injection hole. However, the common sealing element structure is easily affected by stress during the welding process, which causes cracks or breakage, thereby resulting in insufficient airtightness of the battery and ultimately affecting the safety of the battery. SUMMARY

[0003] Embodiments of the utility model provide a sealing element and battery, which solve the problem of cracks or breakage of the sealing element in related technologies.

[0004] In a first aspect, embodiments of the utility model provide a battery cell group, which includes: a sealing main body part adapted to be installed on a top cover; and a sealing compensation part, the sealing main body part being connected to the outer side of the sealing compensation part; wherein at least part of the sealing compensation part is configured to be bent towards the top cover.

[0005] In an embodiment, the bottom of the sealing main body part and the bottom of the sealing compensation part form an accommodating groove, and the distance between the bottom of the sealing compensation part and the bottom of the sealing main body part in the thickness direction of the sealing element decreases in the direction from the edge of the accommodating groove to the center.

[0006] In an embodiment, 0.1≤U1 / U2<1; wherein U1 is the height difference between the center of the bottom of the sealing compensation part and the bottom of the sealing main body part, and U2 is the height difference between the edge of the bottom of the sealing compensation part and the bottom of the sealing main body part.

[0007] In an embodiment, the top of the sealing main body part is adapted to be welded to the top cover, and the top of the sealing main body part includes a deformation part adapted to deform towards the welding position of the sealing main body part and the top cover.

[0008] In an embodiment, the width of the deformation part is 0.3mm to 1.5mm, and the height of the deformation part is 0.1mm to 0.5mm.

[0009] In an embodiment, the sealing element has a first side surface; the top cover is provided with a mounting groove for mounting the sealing element, and the top cover has a second side surface surrounding the mounting groove; wherein the first side surface is adapted to abut against the second side surface and form an included angle with the second side surface.

[0010] In an embodiment, the first side surface is adapted to form a fitting gap with the second side surface, the sealing main body part is adapted to be mounted on the top cover through a welding part, and at least part of the welding part is adapted to fill and seal the fitting gap.

[0011] In one embodiment, the seal has a first side surface and a first bottom surface; the top cover is provided with a mounting groove for mounting the seal, and the top cover has a second side surface and a second bottom surface surrounding the mounting groove; wherein the angle between the first side surface and the first bottom surface and the angle between the second side surface and the second bottom surface satisfy: N=M+K, where N is the angle between the first side surface and the first bottom surface, M is the angle between the second side surface and the second bottom surface, and -10°≤K≤10°.

[0012] In one embodiment, the top cover is provided with a mounting groove for mounting a seal, -0.5mm≤dh≤0.5mm; where d is the depth of the mounting groove and h is the dimension of the seal in the depth direction of the mounting groove.

[0013] Secondly, embodiments of the present invention provide a battery that includes the sealing element of the first aspect.

[0014] This invention provides a sealing element and a battery. The sealing element includes a sealing main body and a sealing compensation part connected to the outside of the sealing compensation part. The sealing main body is used for mounting on a top cover, and at least a portion of the sealing compensation part is configured to bend towards the top cover. The sealing element provided by this invention allows the bent portion of the sealing compensation part to deform in the direction of the stretch when the sealing main body stretches the sealing compensation part due to deformation. This timely releases the stress generated by the sealing main body on the sealing compensation part, thereby reducing the risk of cracks or breakage in the sealing element. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the structure of the sealing element and the top cover provided in this embodiment of the utility model;

[0017] Figure 2 yes Figure 1 Top view of the central seal and top cover;

[0018] Figure 3 yes Figure 2 Cross-sectional view of the middle seal and the top cover;

[0019] Figure 4 yes Figure 3 Enlarged view of section C;

[0020] Figure 5 yes Figure 4Enlarged view of section D;

[0021] Explanation of reference numerals in the attached figures:

[0022] 100. Seal; 110. Seal body; 120. Seal compensation part; 130. Top cover; 140. Injection hole; 150. Receiving groove; 160. Deformation part; 170. First side; 180. Second side; 190. Fitting clearance. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present utility model. In addition, it should be understood that the specific embodiments described herein are only for illustration and explanation of the present utility model and are not intended to limit the present utility model. In the present utility model, unless otherwise stated, directional terms such as "upper" and "lower" generally refer to the upper and lower positions of the device in actual use or operation, specifically the drawing directions in the accompanying drawings; while "inner" and "outer" refer to the outline of the device.

[0024] To address the problem in the aforementioned related technologies where sealing elements are prone to cracking or breakage, leading to insufficient battery airtightness, this utility model provides a sealing element 100, please refer to... Figures 1 to 4 , Figure 1 This is a schematic diagram of the structure of the sealing element and the top cover provided in this embodiment of the utility model. Figure 2 yes Figure 1 Top view of the central seal and top cover. Figure 3 yes Figure 2 Cross-sectional view of the middle seal and the top cover. Figure 4 yes Figure 3 The enlarged view of section C shows that the seal 100 includes a sealing body portion 110 and a sealing compensation portion 120. The sealing body portion 110 is connected to the outside of the sealing compensation portion 120 and is mounted on the top cover 130 of the battery to seal the liquid injection hole 140 provided on the top cover 130. At least a portion of the sealing compensation portion 120 is configured to bend toward the top cover 130.

[0025] In related technologies, the welding area of ​​the seal is typically located between the top cover and the main sealing body. The welding process causes a sudden temperature increase in the welding area, resulting in a significant temperature difference between the main sealing body and the sealing compensation part. After welding, during cooling, the main sealing body contracts due to thermal expansion, causing stress on the sealing compensation part. This leads to the sealing compensation part being stretched by the main sealing body. Since the top and bottom of the sealing compensation part are usually designed with openings parallel to the injection hole, the sealing compensation part cannot effectively release the stress generated by the main sealing body, resulting in cracks or breakage, ultimately affecting the battery's airtightness.

[0026] In this embodiment, at least a portion of the sealing compensation portion 120 is designed to be bent toward the top cover 130. The main purpose of this structural design is to provide an effective compensation mechanism when the sealing compensation portion 120 tends to extend from the center outwards due to the pulling of the sealing body portion 110 during the cooling process of the seal 100. Specifically, when the sealing body portion 110 pulls the sealing compensation portion 120 due to deformation, the bent portion of the sealing compensation portion 120 deforms in the direction of the pull, thereby releasing the stress generated by the sealing body portion 110 on the sealing compensation portion 120 in a timely manner, thus reducing the risk of cracks or breakage of the seal 100.

[0027] To further improve the airtightness of the injection hole 140, a sealing nail (not shown in the figure) is usually added to the injection hole 140 of the top cover 130. The sealing nail is used to seal the injection hole 140 after the electrolyte injection operation is completed to prevent electrolyte from overflowing and air from entering the cell.

[0028] Therefore, in order to accommodate the space requirements of the sealing nail so that the seal 100 can provide sufficient space after installation to accommodate the portion of the sealing nail that extends beyond the injection hole 140, in some embodiments, see [reference needed]. Figure 3 and Figure 4 The bottom of the sealing body 110 and the bottom of the sealing compensation part 120 together form a receiving groove 150. The receiving groove 150 can effectively accommodate the portion of the sealing glue nail that extends beyond the injection hole 140, so as to avoid interference between the sealing element 100 and the sealing glue nail during installation. In addition, the bottom of the sealing compensation part 120 and the bottom of the sealing body 110 are aligned along the edge of the receiving groove 150 towards the center of the receiving groove 150 (see reference). Figure 3 The bottom of the sealing compensation part 120 is moderately bent toward the injection hole 140 in the X direction, thereby forming the compensation structure as described above.

[0029] To provide sufficient space for the sealing nails and to ensure that the sealing compensation portion 120 has enough bending to release the stress generated by the sealing body portion 110 on the sealing compensation portion 120, in some embodiments, see [reference needed]. Figure 4 The ratio of the height difference U1 between the center of the bottom of the sealing compensation part 120 and the bottom of the sealing main body 110 and the height difference U2 between the edge of the bottom surface of the sealing compensation part 120 and the bottom of the sealing main body 110 is set between 0.1 and 1.

[0030] Specifically, in order to ensure that the bottom of the sealing compensation part 120 can be bent toward the injection hole 140 to provide the compensation design as described above, it is necessary to ensure that the ratio of U1 to U2 is less than 1. In addition, experimental verification shows that when the ratio of U1 to U2 is less than 0.1, the receiving groove 150 will be too narrow to effectively accommodate the portion of the sealing nail that extends beyond the injection hole 140. This will cause the seal 100 to interfere with the sealing nail during installation, making it impossible for the seal 100 to effectively seal the injection hole 140, resulting in insufficient airtightness inside the battery.

[0031] Therefore, setting the ratio of U1 to U2 between 0.1 and 1 ensures that the portion of the sealing nail that extends beyond the injection hole 140 can be fully accommodated in the receiving groove 150 without interfering with the seal 100, and also ensures that the curved portion of the sealing compensation part 120 can meet the compensation design as described above.

[0032] The top of the sealing body 110 is connected to the top cover 130 by welding to ensure that the seal 100 can effectively seal the injection hole 140. However, during the welding process, the welding position of the seal 100 will undergo thermal expansion and contraction, resulting in a relatively concentrated stress at the welding position. If the stress cannot be effectively released, it may cause the seal 100 to crack or break, thereby affecting the airtightness of the battery.

[0033] To address the above problems, in some embodiments, reference can be made to Figure 4 , Figure 5 , Figure 5 yes Figure 4 In the enlarged view of section D, a deformation portion 160 is provided on the top of the sealing body 110 to accommodate the stress generated in the seal 100 during the cooling process after welding. Specifically, when the weld between the sealing body 110 and the top cover 130 shrinks due to cooling, the deformation portion 160 can locally deform towards the weld to release the stress originally concentrated in the welding area, making the stress distribution of the seal 100 more uniform. This reduces the risk of cracking or breaking of the seal 100 due to excessive local stress at the weld, thereby ensuring the reliability of the seal 100.

[0034] In some embodiments, the width W of the deformable portion 160 is set in the range of 0.3 mm to 1.5 mm, and the height H of the deformable portion 160 is set in the range of 0.1 mm to 0.5 mm. This structural design aims to ensure that the seal 100 can effectively seal the injection hole 140 after welding and can withstand the thermal expansion and stress concentration problems that may occur during the welding process.

[0035] Experiments have shown that when the width W of the deformable portion 160 is less than 0.3 mm, the welding area of ​​the seal 100 is too narrow, resulting in an inability to completely seal the injection hole 140, leading to poor sealing performance. When the width W of the deformable portion 160 is greater than 1.5 mm, its excessive width requires greater stress to deform, increasing the difficulty of deformation and potentially preventing it from adequately adapting to structural changes caused by thermal expansion after welding, thus affecting the reliability of the sealing system. Therefore, the optimal design width range for the seal 100 is 0.3 mm to 1.5 mm. Within this range, the deformable portion 160 provides sufficient welding area during welding while ensuring flexibility in deformation after welding, avoiding the adverse effects of being too narrow or too wide.

[0036] Secondly, when the height H of the deformable portion 160 is less than 0.1 mm, it is too shallow and cannot effectively disperse the stress concentrated in the welding area. During welding, the accumulation of local stress may lead to uneven thermal deformation in the welding area, thus affecting the sealing effect. Conversely, when the height H of the deformable portion 160 is greater than 0.5 mm, it creates spatial redundancy in the height direction, causing the deformable portion 160 to protrude excessively, affecting the spatial layout and structural stability of the battery. Therefore, the optimal design height range for the seal 100 is between 0.1 mm and 0.5 mm. Within this range, the deformable portion 160 can effectively balance the stress distribution, ensuring that it can appropriately release the stress in the welding area after welding, preventing cracks or deformation caused by stress concentration, and avoiding unnecessary space waste.

[0037] In some embodiments, please refer to Figure 4 , Figure 5 The top cover 130 is provided with a mounting groove for mounting the seal 100, and includes a second side 180 forming the mounting groove. The seal 100 includes a first side 170 opposite to the second side 180, the first side 170 abutting against the second side 180 and forming an angle with the second side 180.

[0038] First, the angle formed by the first side 170 and the second side 180 enhances the stability of the seal 100. When the first side 170 of the seal 100 contacts the second side 180 of the top cover 130, the clamping force applied by the second side 180 firmly fixes the seal 100 in the mounting groove, preventing displacement of the seal 100 during operation and thus ensuring the sealing performance of the seal 100. Second, during the welding process of the seal 100, the seal 100 undergoes thermal expansion due to a sudden temperature rise. The angle design helps the seal 100 disperse the deformation stress caused by thermal expansion, maintaining its stability during temperature changes and reducing the risk of seal failure due to excessive deformation.

[0039] Furthermore, the first side 170 and the second side 180 form a fitting gap 190, and the sealing body 110 is welded to the top cover 130 via a welding part. During the welding process, at least a portion of the welding part fills the fitting gap 190. The design of the fitting gap 190 not only facilitates the installation of the seal 100, but also effectively solves the potential problems caused by the thermal expansion of the seal 100, thereby improving the sealing effect of the seal 100 on the injection hole 140 during the welding process.

[0040] First, the presence of the mating clearance 190 provides space for the installation of the seal 100. The seal 100 usually needs to be precisely installed into a pre-set mounting groove, and the presence of the mating clearance 190 can reduce the friction that may occur during the installation of the seal 100, thus making the installation process of the seal 100 simpler.

[0041] Secondly, the clearance 190 also provides sufficient space for the thermal expansion of the seal 100. During the welding process, the seal 100 will expand due to the high temperature. If the seal 100 cannot expand freely in the installation position, it may damage the structure of the seal 100 itself and the structure of the top cover 130. By providing expansion space for the seal 100, the clearance 190 can effectively alleviate the internal pressure generated by the thermal expansion of the seal 100, thereby reducing the risk of damage to the top cover 130 or the seal 100.

[0042] In addition, after the welding operation is completed, the welded part of the sealing body 110 can fill into the mating gap 190, so that the mating gap 190 is effectively sealed, thereby ensuring the airtightness of the seal 100 to the injection hole 140.

[0043] In some embodiments, please refer to Figure 5The top cover 130 includes a second side surface 180 and a second bottom surface forming a mounting groove. The sealing element 100 includes a first side surface 170 and a first bottom surface, which are respectively opposite to the second side surface 180 and the second bottom surface. The angle N between the first side surface 170 and the first bottom surface and the angle M between the second side surface 180 and the second bottom surface satisfy the following condition: N = M + K, where K is a constant and its value satisfies the condition: -10° ≤ K ≤ 10°.

[0044] Experiments have shown that, firstly, if MN > 10°, the seal 100 will experience significant resistance during installation, making installation difficult and potentially preventing it from being installed properly. Secondly, the large difference in angle increases the clearance 190 between the first side 170 and the second side 180, affecting the sealing effect.

[0045] On the other hand, if MN < -10°, the welding position between the top cover 130 and the seal 100 will be too far apart, which may prevent precise alignment during welding, thus affecting the welding quality and even the welding strength, thereby affecting the sealing effect of the seal 100.

[0046] Therefore, ensuring that the difference K between the included angles N and M is controlled between -10° and 10° is to guarantee the fitting accuracy between the seal 100 and the mounting groove of the top cover 130, thereby optimizing the installation process and avoiding problems such as installation difficulties, poor fit, or poor sealing effect caused by excessive angle differences. This structural design not only improves the assembly efficiency of the seal 100 but also ensures the reliability of the sealing system, reducing the risk of problems such as poor welding or seal failure.

[0047] In some embodiments, the difference between the depth d of the mounting groove and the dimension h of the seal 100 in the depth direction of the mounting groove is controlled between -0.5 mm and 0.5 mm.

[0048] Specifically, experiments have shown that when the absolute value of the difference between the two is greater than 0.5mm, it will cause a mismatch between the dimensions of the seal 100 and the mounting groove, increasing the difficulty of installation. Secondly, the large height difference between the two can lead to welding position deviations during the welding process, and may even cause seal failure.

[0049] Therefore, by strictly controlling the difference between the depth d of the mounting groove and the dimension h of the seal 100 in the direction of the mounting groove depth to within the range of -0.5mm to 0.5mm, the installation difficulties and welding inconveniences caused by excessive height difference can be effectively avoided.

[0050] This invention provides a sealing element 100, which includes a sealing main body 110 and a sealing compensation part 120 connected to the outside of a sealing compensation part 120. The sealing main body 110 is used for mounting on a top cover 130, and at least a portion of the sealing compensation part 120 is configured to bend towards the top cover 130. The sealing element 100 provided by this invention designs at least a portion of the sealing compensation part 120 to bend towards the top cover 130. The main purpose of this structural design is to provide an effective compensation mechanism for the bending portion of the sealing compensation part 120 when the sealing compensation part 120 tends to extend from the center outwards due to the pulling of the sealing main body 110 during the cooling process of the sealing element 100. Specifically, when the sealing body 110 stretches the sealing compensation part 120 due to deformation, the bent portion of the sealing compensation part 120 deforms in the direction of stretching, thereby releasing the stress generated by the sealing body 110 on the sealing compensation part 120 in a timely manner, thereby reducing the risk of cracks or breakage of the seal 100.

[0051] This utility model also provides a battery that includes the aforementioned sealing element 100 and has all the advantages of the aforementioned sealing element 100, which will not be repeated here.

[0052] The embodiments of this utility model have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this utility model. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this utility model. Therefore, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A sealing element, characterized in that, include: The sealing body is suitable for installation on the top cover; as well as A sealing compensation part, wherein the sealing main body part is connected to the outside of the sealing compensation part; At least a portion of the sealing compensation portion is configured to bend toward the top cover.

2. The seal according to claim 1, characterized in that, The bottom of the sealing main body and the bottom of the sealing compensation part form a receiving groove. The distance between the bottom of the sealing compensation part and the bottom of the sealing main body in the thickness direction of the sealing element decreases along the edge of the receiving groove towards the center.

3. The seal according to claim 2, characterized in that, 0.1≤U1 / U2<1; where U1 is the height difference between the center of the bottom of the sealing compensation part and the bottom of the sealing body part, and U2 is the height difference between the edge of the bottom surface of the sealing compensation part and the bottom of the sealing body part.

4. The seal according to any one of claims 1-3, characterized in that, The top of the sealing body is adapted to be welded to the top cover, and the top of the sealing body includes a deformable portion adapted to deform toward the weld between the sealing body and the top cover.

5. The seal according to claim 4, characterized in that, The width of the deformable part is 0.3 mm to 1.5 mm, and the height of the deformable part is 0.1 mm to 0.5 mm.

6. The seal according to claim 1, characterized in that, The seal has a first side surface; the top cover has a mounting groove for mounting the seal, and the top cover has a second side surface surrounding the mounting groove; wherein the first side surface is adapted to abut against the second side surface and form an angle with the second side surface.

7. The seal according to claim 6, characterized in that, The first side is adapted to form a mating gap with the second side, the sealing body is adapted to be installed on the top cover by a welding part, and at least a portion of the welding part is adapted to fill the mating gap and seal the mating gap.

8. The seal according to claim 1, characterized in that, The sealing element has a first side surface and a first bottom surface; the top cover is provided with a mounting groove for mounting the sealing element, and the top cover has a second side surface and a second bottom surface surrounding the mounting groove; wherein, the angle between the first side surface and the first bottom surface and the angle between the second side surface and the second bottom surface satisfy: N=M+K, where N is the angle between the first side surface and the first bottom surface, M is the angle between the second side surface and the second bottom surface, and -10°≤K≤10°.

9. The seal according to any one of claims 1-3, characterized in that, The top cover is provided with a mounting groove for installing the seal, -0.5mm≤dh≤0.5mm; where d is the depth of the mounting groove and h is the dimension of the seal in the depth direction of the mounting groove.

10. A battery, characterized in that, Includes the seal as described in any one of claims 1-9.

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