Battery cap and battery

Abstract

The utility model relates to the technical field of batteries, and discloses a battery cap and a battery. The battery cap comprises a top cover and an anti-explosion valve, the top cover covers the top of the anti-explosion valve, a height difference exists between the peripheral edge of the top cover and the peripheral edge of the anti-explosion valve, and a height difference gap is formed between the peripheral edge of the top cover and the peripheral edge of the anti-explosion valve; the sealing ring is arranged on the outer side of the top cover and the outer side of the anti-explosion valve in a sleeving mode, a first sealing protrusion is arranged on the inner wall of the sealing ring, and the first sealing protrusion is arranged in the height difference gap in a matched mode and seals the height difference gap. According to the battery cap provided by the utility model, the height difference gap is effectively sealed by utilizing the first sealing bulge on the sealing ring, and various challenges in actual production and use are considered, so that a battery can still keep good sealing performance and safety even under the condition that manufacturing errors exist.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, specifically to a battery cap and a battery. Background Technology

[0002] In traditional battery designs, the battery cap typically includes a top cover and an explosion-proof valve. These components work together to ensure the stability and safety of the battery's internal environment. However, during actual manufacturing, due to limitations in production processes or material properties, slight height differences often occur between the top cover and the explosion-proof valve, creating a height difference gap. In existing technologies, this height difference between the top cover and the explosion-proof valve is unavoidable. This height difference results in a gap, which can become a potential leakage point, affecting the overall sealing performance of the battery.

[0003] Due to the presence of these height difference gaps, traditional sealing methods may not provide sufficient sealing. Even with conventional sealing rings, without special design to address the height difference, it remains difficult to effectively seal these gaps. These height difference gaps not only affect the battery's sealing performance but can also allow external substances (such as moisture and dust) to enter the battery, negatively impacting its safety and lifespan. This problem may be particularly pronounced in extreme environments. Utility Model Content

[0004] In view of this, the present invention provides a battery cap and a battery to solve the problem of poor battery sealing performance in related technologies.

[0005] In a first aspect, this utility model provides a battery cap, comprising:

[0006] A top cover and an explosion-proof valve, wherein the top cover is disposed on the top of the explosion-proof valve, and there is a height difference between the outer periphery of the top cover and the outer periphery of the explosion-proof valve, forming a height difference gap;

[0007] A sealing ring is fitted onto the outside of the top cover and the explosion-proof valve, and a first sealing protrusion is provided on the inner wall of the sealing ring. The first sealing protrusion fits into the height difference gap and seals it.

[0008] Beneficial effects: (1) Targeted solution to the height difference gap problem: By setting the first sealing protrusion on the inner wall of the sealing ring and precisely embedding it into the height difference gap between the top cover and the explosion-proof valve, this unavoidable manufacturing defect is effectively compensated and the overall sealing performance is improved.

[0009] (2) Improved safety and reliability: The better sealing design prevents external substances (such as moisture, dust, etc.) from entering the battery, significantly improving the safety and long-term stability of the battery under various usage conditions.

[0010] (3) Highly adaptable design: The first sealing protrusion of the sealing ring has a certain elastic compensation capability, which can adapt to a certain degree of manufacturing tolerance and material deformation, making the design more versatile and adaptable, and suitable for different batches of products.

[0011] In one alternative embodiment, the outer periphery of the explosion-proof valve is bent in the direction toward the top cover to form an annular limiting portion, the annular limiting portion being disposed around the top cover and lower than the outer periphery of the top cover, and the height difference gap being formed between the top of the annular limiting portion and the outer periphery of the top cover.

[0012] Beneficial effects: On the one hand, the design of the annular limiting part allows the top cover to be securely placed on the explosion-proof valve, reducing the risk of displacement caused by vibration or external impact and enhancing the stability of the entire battery cap structure; on the other hand, the height difference gap between the annular limiting part and the top cover is carefully designed to ensure that the first sealing protrusion can be perfectly embedded and provide a reliable sealing effect, thus improving the overall sealing performance.

[0013] In one alternative embodiment, the sealing ring includes a sealing body portion and a first bending portion, the sealing body portion being sleeved on the outside of the annular limiting portion, and the first bending portion being bent in a direction toward the top of the top cover and pressed against the top of the top cover.

[0014] The first sealing protrusion is disposed on the inner wall of the sealing body or on the inner wall of the first bend.

[0015] Beneficial effects: The dual-sealing design of the sealing body and the first bend ensures excellent sealing performance even in complex operating environments, effectively preventing external impurities from entering the battery. Furthermore, the first sealing protrusion can be installed on the inner wall of either the sealing body or the first bend, providing greater design flexibility and allowing the sealing strategy to be adjusted according to actual needs to adapt to different application scenarios.

[0016] In addition, the design of the first bend not only increases the contact area between the sealing ring and the top cover, but also improves the stability and reliability of the entire structure and reduces the risk of displacement caused by external impacts.

[0017] In one alternative embodiment, the first sealing protrusion is disposed on the inner wall of the first bend and extends in a direction toward the top of the annular limiting portion.

[0018] Beneficial effects: On the one hand, the first sealing protrusion is precisely positioned on the inner wall of the first bend and extends towards the top of the annular limiting part, providing a tighter sealing coverage and significantly improving the reliability and durability of the seal. This design allows the sealing ring to adapt to certain manufacturing tolerances and material deformations, ensuring good sealing performance even in the presence of minor errors.

[0019] On the other hand, by increasing the contact area between the sealing ring and the top cover and the annular limiting part, the integrity and stability of the overall structure are improved, and the possibility of sealing failure due to external factors is reduced.

[0020] In one alternative embodiment, the end of the first sealing protrusion facing the annular limiting portion is disposed in contact with the top of the annular limiting portion, and the side of the first sealing protrusion away from the top cover is disposed in contact with the inner wall of the sealing body portion, and the side of the first sealing protrusion near the top cover is disposed in contact with the outer periphery of the top cover.

[0021] Beneficial effects: By setting the end of the first sealing protrusion facing the annular limiting part, the side away from the top cover, and the side close to the top cover to contact the annular limiting part, the sealing body, and the top cover respectively, a more tight and reliable sealing effect is achieved, which greatly enhances the sealing performance of the battery cap and the stability of its overall structure.

[0022] In one optional embodiment, the first sealing protrusion is interference-fitted with the height difference gap, wherein, when the sealing ring is in the unassembled state, the height of the height difference gap ranges from 0.05mm to 0.5mm, and the height of the first sealing protrusion ranges from 0.1mm to 0.8mm.

[0023] Beneficial effects: By precisely controlling the dimensional relationship between the first sealing protrusion and the height difference gap, an interference fit is achieved, providing a more reliable sealing effect and ensuring the stability and safety of the battery's internal environment.

[0024] In one optional embodiment, the sealing ring further includes a second bend that bends toward the bottom of the explosion-proof valve, the top surface of the second bend being spaced apart from the bottom of the explosion-proof valve; a second sealing protrusion is provided on the top surface of the second bend, the top of the second sealing protrusion abutting against the bottom of the explosion-proof valve.

[0025] Beneficial effects: By adding a second bend and setting a second sealing protrusion on its inner wall, a multi-layered sealing structure is formed, which not only significantly improves the overall sealing performance and structural stability of the sealing ring, but also provides stronger protection for the safe operation of the battery.

[0026] In one optional embodiment, the height of the second sealing protrusion is greater than the distance between the second bend and the explosion-proof valve, wherein, when the sealing ring is in the unassembled state, the height of the second sealing protrusion ranges from 0.1mm to 0.5mm.

[0027] Beneficial effects: By precisely controlling the height of the second sealing protrusion to be greater than the distance between the second bend and the explosion-proof valve, an effective interference fit is achieved, ensuring that the sealing ring can provide the necessary pressure when embedded in the gap, thereby forming a tight seal. At the same time, the design allows for a certain range of dimensional tolerances, and through the elastic compensation capability of the second sealing protrusion, this design scheme has strong adaptability and flexibility, suitable for different batches of products and application scenarios.

[0028] In one alternative embodiment, a fitting gap is formed between the second sealing protrusion, the sealing body portion, and the explosion-proof valve, and the fitting gap is filled with structural adhesive.

[0029] Beneficial effects: This embodiment, based on the original first and second sealing protrusions, forms a more complex and reliable multi-layered sealing mechanism through the filling of structural adhesive. This design not only compensates for any potential minor defects but also provides an additional protective barrier, ensuring the stability and safety of the battery's internal environment.

[0030] Secondly, this utility model also provides a battery, comprising:

[0031] The battery cap as described in the first aspect of the present invention;

[0032] A battery housing and a cell assembly, wherein the cell assembly is installed inside the battery housing and a battery cap is placed on top of the battery housing, wherein the battery housing presses the sealing ring against the outer surface of the top cover and the explosion-proof valve.

[0033] Beneficial effects: According to the battery embodiment of this utility model, the sealing ring is tightly fitted to the outer surface of the top cover and the explosion-proof valve by the pressing action of the battery casing, effectively preventing external substances from entering the battery or internal substances from leaking out. At the same time, the pressing action not only enhances the sealing effect but also improves the stability of the entire structure, reducing the risk of seal failure caused by external impact or vibration.

[0034] In addition, the above design allows the position and pressure distribution of the sealing ring to be automatically adjusted by the clamping action of the battery casing during assembly, which simplifies the assembly process and reduces the possibility of human error. Attached Figure Description

[0035] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0036] Figure 1 This is a cross-sectional view of the battery cap of this utility model embodiment when it is not assembled onto the battery casing;

[0037] Figure 2 This is a cross-sectional view of the battery cap of this utility model embodiment when it is partially assembled onto the battery casing;

[0038] Figure 3 This is a cross-sectional view of the battery cap of this utility model embodiment when it is fully assembled onto the battery casing;

[0039] Figure 4 for Figure 3 Enlarged view of point A in the middle;

[0040] Figure 5 This is a top view of the perforated plate of the battery cap according to an embodiment of the present invention.

[0041] Explanation of reference numerals in the attached figures:

[0042] 1. Top cover; 11. Height difference gap; 2. Explosion-proof valve; 21. Annular limiting part; 3. Sealing ring; 31. Sealing body part; 32. First bending part; 321. First sealing protrusion; 33. Second bending part; 331. Second sealing protrusion; 4. Structural adhesive; 5. Orifice plate; 6. Insulating ring; 7. Battery casing; 8. Battery cell assembly. Detailed Implementation

[0043] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0044] In the description of the embodiments of this utility model, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this utility model. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0045] In the description of the embodiments of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this utility model based on the specific circumstances.

[0046] In this embodiment of the utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0047] The present invention provides a battery cap and a battery. It should be noted that the battery described in the second aspect of the present invention includes the battery cap described in the first aspect of the present invention.

[0048] like Figures 1 to 5 As shown, the battery cap according to the first aspect of the present invention includes a top cover 1, an explosion-proof valve 2, and a sealing ring 3.

[0049] The top cover 1 is placed on top of the explosion-proof valve 2. There is a height difference between the outer periphery of the top cover 1 and the outer periphery of the explosion-proof valve 2, forming a height difference gap 11. The sealing ring 3 is sleeved on the outside of the top cover 1 and the explosion-proof valve 2, and the inner wall of the sealing ring 3 is provided with a first sealing protrusion 321. The first sealing protrusion 321 fits into the height difference gap 11 and seals it.

[0050] Based on the above-described battery cap structure, the specific structure of the battery cap of this utility model is described as follows: The top cover 1 is positioned on top of the explosion-proof valve 2. During actual assembly, an unavoidable height difference will form between the outer periphery of the top cover 1 and the outer periphery of the explosion-proof valve 2, resulting in the so-called "height difference gap 11". It is understandable that although the aforementioned height difference is caused by fitting defects during the manufacturing process, due to technological limitations, this height difference is almost unavoidable.

[0051] The sealing ring 3 is sleeved on the outside of the top cover 1 and the explosion-proof valve 2. Furthermore, the present invention provides a first sealing protrusion 321 on the inner wall of the sealing ring 3. The main function of the first sealing protrusion 321 is to fill the gap caused by the height difference between the top cover 1 and the explosion-proof valve 2, and to achieve effective sealing by embedding it into the gap.

[0052] Specifically, the sealing mechanism of the first sealing protrusion 321 is as follows: The first sealing protrusion 321 is specifically designed to fill and seal these unavoidable height difference gaps 11. It ensures that the seal is maintained even with minor manufacturing errors or material deformation through an interference fit (i.e., the size of the sealing protrusion is slightly larger than the gap size). Thus, this design not only enhances the overall sealing performance of the battery cap but also improves the safety and stability of the battery, preventing external impurities from entering the battery and affecting its normal operation.

[0053] As can be seen from the above, the basic working principle of this utility model is as follows: During the manufacturing process, due to limitations in production technology or material characteristics, a slight height difference may occur between the top cover 1 and the explosion-proof valve 2, forming a height difference gap 11. To solve this problem, this utility model employs a sealing ring 3 with a first sealing protrusion 321. The sealing ring 3 is fitted onto the outside of the top cover 1 and the explosion-proof valve 2, and the first sealing protrusion 321 is specifically designed to embed and seal the aforementioned height difference gap 11. The first sealing protrusion 321, through an interference fit (i.e., its size is slightly larger than the size of the height difference gap 11), ensures that even with minor manufacturing errors or material deformation, the sealing performance is maintained. This tight fit effectively prevents external substances from entering the battery, ensuring the safety and stability of the battery.

[0054] Furthermore, the general assembly steps for the battery cap are as follows:

[0055] First, prepare the top cover 1, the explosion-proof valve 2, and the sealing ring 3 with the first sealing protrusion 321. Ensure all components are clean and undamaged for smooth assembly. Place the explosion-proof valve 2 correctly in its designated position. Carefully check that the outer periphery of the explosion-proof valve 2 meets design requirements to ensure accurate height matching in subsequent steps. Next, place the top cover 1 on top of the explosion-proof valve 2. During this process, a height difference will naturally form between the outer periphery of the top cover 1 and the outer periphery of the explosion-proof valve 2, creating a height difference gap 11. Finally, fit the sealing ring 3 onto the outside of the top cover 1 and the explosion-proof valve 2. Ensure that the first sealing protrusion 321 on the sealing ring 3 is accurately embedded in the previously formed height difference gap 11. This step is crucial for ensuring the overall sealing performance of the device and requires careful operation to ensure the sealing ring 3 is correctly positioned. After assembly, conduct a thorough inspection to confirm that the first sealing protrusion 321 of the sealing ring 3 effectively seals the height difference gap 11 and that there are no other obvious assembly defects or leaks.

[0056] In traditional battery designs, the battery cap typically includes a top cover and an explosion-proof valve. These components work together to ensure the stability and safety of the battery's internal environment. However, during actual manufacturing, due to limitations in production processes or material properties, slight height differences often occur between the top cover and the explosion-proof valve, creating a height difference gap. In existing technologies, this height difference between the top cover and the explosion-proof valve is unavoidable. This height difference results in a gap, which can become a potential leakage point, affecting the overall sealing performance of the battery.

[0057] Due to the presence of these height difference gaps, traditional sealing methods may not provide sufficient sealing. Even with conventional sealing rings, without special design to address the height difference, it remains difficult to effectively seal these gaps. These height difference gaps not only affect the battery's sealing performance but can also allow external substances (such as moisture and dust) to enter the battery, negatively impacting its safety and lifespan. This problem may be particularly pronounced in extreme environments.

[0058] In summary, in order to solve the technical defects existing in the above-mentioned related technologies, this utility model provides a battery cap that effectively seals the height difference gap 11 by utilizing the first sealing protrusion 321 on the sealing ring 3, ensuring that the battery can still maintain good sealing performance and safety even in the presence of manufacturing errors.

[0059] Furthermore, the battery cap of this utility model has at least the following advantages compared to related technologies:

[0060] (1) Targeted solution to the height difference gap 11 problem: By setting the first sealing protrusion 321 on the inner wall of the sealing ring 3 and precisely embedding it into the height difference gap 11 between the top cover 1 and the explosion-proof valve 2, this unavoidable manufacturing defect is effectively compensated and the overall sealing performance is improved.

[0061] (2) Enhanced sealing performance: The first sealing protrusion 321 adopts an interference fit (i.e. its size is slightly larger than the size of the height difference gap 11), which can ensure the sealing effect even if there are minor manufacturing errors or material deformation, thus providing more reliable sealing protection.

[0062] (3) Improved safety and reliability: The better sealing design prevents external substances (such as moisture, dust, etc.) from entering the battery, significantly improving the safety and long-term stability of the battery under various usage conditions.

[0063] (4) Highly adaptable design: The first sealing protrusion 321 of the sealing ring 3 has a certain elastic compensation capability, which can adapt to a certain degree of manufacturing tolerance and material deformation, making the design more versatile and adaptable, and suitable for different batches of products.

[0064] like Figure 1 , Figure 3 and Figure 4 As shown, according to some embodiments of the present invention, the outer periphery of the explosion-proof valve 2 is bent in the direction toward the top cover 1 to form an annular limiting portion 21. The annular limiting portion 21 is disposed around the top cover 1 and is lower than the outer periphery of the top cover 1, and a height difference gap 11 is formed between the top of the annular limiting portion 21 and the outer periphery of the top cover 1. It can be understood that the annular limiting portion 21 and the upper surface of the explosion-proof valve 2 together define a concave mating groove, the top cover 1 is fitted in the mating groove, and the outer periphery of the top cover 1 is surrounded by the annular limiting portion 21.

[0065] In this embodiment, the outer periphery of the explosion-proof valve 2 is designed to be curved toward the top cover 1, thereby forming an annular limiting part 21. This design not only helps to fix the position of the top cover 1, but also ensures a sealing effect by precisely controlling the relative position between the top cover 1 and the explosion-proof valve 2.

[0066] There is a certain height difference between the top of the annular limiting part 21 and the outer periphery of the top cover 1, which forms a height difference gap 11. This gap is specially designed for the subsequent insertion of the first sealing protrusion 321 of the sealing ring 3, thereby achieving an effective seal.

[0067] The annular limiting part 21 and the upper surface of the explosion-proof valve 2 together form a recessed mating groove. This mating groove provides space for the top cover 1 and ensures that the top cover 1 can be accurately positioned in the predetermined position. The top cover 1 is designed to fit within this recessed mating groove. Since the outer periphery of the top cover 1 is surrounded by the annular limiting part 21, this not only increases the overall stability of the structure but also further ensures a tight fit between the top cover 1 and the explosion-proof valve 2, improving the overall sealing performance.

[0068] In this way, on the one hand, through the design of the annular limiting part 21, the top cover 1 can be stably placed on the explosion-proof valve 2, reducing the risk of displacement caused by vibration or external impact and enhancing the stability of the entire battery cap structure; on the other hand, the height difference gap 11 between the annular limiting part 21 and the top cover 1 is carefully designed to ensure that the first sealing protrusion 321 can be perfectly embedded and provide a reliable sealing effect, thereby improving the overall sealing performance.

[0069] like Figure 1 , Figure 3 and Figure 4 As shown, according to some embodiments of the present invention, the sealing ring 3 includes a sealing body part 31 and a first bending part 32. The sealing body part 31 is sleeved on the outside of the annular limiting part 21, and the first bending part 32 is bent in the direction toward the top of the top cover 1 and pressed against the top of the top cover 1.

[0070] The first sealing protrusion 321 is provided on the inner wall of the sealing body 31 or on the inner wall of the first bent portion 32.

[0071] In this embodiment, the sealing ring 3 is designed with two main parts: a sealing body 31 and a first bend 32. These two parts work together to effectively seal the height difference gap 11 between the top cover 1 and the explosion-proof valve 2.

[0072] Specifically, the sealing body 31 is sleeved on the outside of the annular limiting part 21, so that the sealing body 31 can tightly wrap the annular limiting part 21, thereby providing a preliminary sealing effect and providing a supporting foundation for the subsequent first sealing protrusion 321.

[0073] It is understood that the sealing body 31, as the basic part of the sealing ring 3, mainly serves to provide a preliminary sealing layer around the annular limiting part 21. By tightly fitting the annular limiting part 21, the sealing body 31 can prevent external substances from directly entering the battery, while providing a stable mounting platform for the first sealing protrusion 321.

[0074] The first bend 32 extends from the sealing body 31, bends in the direction toward the top of the top cover 1, and fits tightly against the top of the top cover 1, thereby not only increasing the contact area between the sealing ring 3 and the top cover 1, but also further enhancing the overall sealing performance.

[0075] It is understandable that the design of the first bend 32 is to increase the contact area between the sealing ring 3 and the top cover 1, ensuring that the sealing ring 3 can better fit the top of the top cover 1. In this way, the first bend 32 not only improves the sealing effect, but also enhances the overall stability of the structure.

[0076] In some specific embodiments, the first sealing protrusion 321 can be selectively disposed on the inner wall of the sealing body 31 or the first bend 32, depending on specific requirements. For example, the first sealing protrusion 321 can be disposed on the inner wall of the sealing body 31 or the inner wall of the first bend 32. Regardless of its location, the main function of the first sealing protrusion 321 is to be embedded in the height difference gap 11 between the top cover 1 and the explosion-proof valve 2, thereby achieving an effective seal. This flexibility allows for adjustments based on different manufacturing processes and assembly requirements to achieve the best sealing effect.

[0077] In summary, the dual sealing design of the sealing body 31 and the first bend 32 ensures excellent sealing performance even in complex operating environments, effectively preventing external impurities from entering the battery. Furthermore, the first sealing protrusion 321 can be installed on the inner wall of either the sealing body 31 or the first bend 32, providing greater design flexibility and allowing the sealing strategy to be adjusted according to actual needs to adapt to different application scenarios.

[0078] In addition, the design of the first bend 32 not only increases the contact area between the sealing ring 3 and the top cover 1, but also improves the stability and reliability of the entire structure and reduces the risk of displacement caused by external impact.

[0079] like Figure 1 , Figure 3 and Figure 4 As shown, in a specific embodiment of the present invention, the first sealing protrusion 321 is disposed on the inner wall of the first bent portion 32 and extends in the direction toward the top of the annular limiting portion 21.

[0080] It is understandable that, since the first sealing protrusion 321 is located on the inner wall of the first bend 32, it can fit tightly against the top of the top cover 1 and extend along the outer periphery of the top cover 1 to near the top of the annular limiting part 21. This design ensures that the first sealing protrusion 321 can effectively embed into the height difference gap 11, achieving a better sealing effect. At the same time, it not only increases the contact area between the sealing ring 3 and the top cover 1 and the annular limiting part 21, but also improves the stability of the entire structure.

[0081] In this embodiment, by designing the first sealing protrusion 321 to extend in the direction toward the top of the annular limiting portion 21, it can better accommodate height differences that may occur during the manufacturing process. The above-mentioned extension method ensures that even with minor dimensional deviations or material deformations, the sealing performance can be maintained through the elastic compensation capability of the first sealing protrusion 321.

[0082] In this way, on the one hand, the first sealing protrusion 321 is precisely positioned on the inner wall of the first bend 32 and extends in the direction toward the top of the annular limiting portion 21, providing a tighter sealing coverage and significantly improving the reliability and durability of the seal. This design allows the sealing ring 3 to adapt to certain manufacturing tolerances and material deformations, ensuring that good sealing performance is maintained even in the presence of minor errors.

[0083] On the other hand, by increasing the contact area between the sealing ring 3 and the top cover 1 and the annular limiting part 21, the integrity and stability of the overall structure are improved, and the possibility of sealing failure due to external factors is reduced.

[0084] like Figure 1 , Figure 3 and Figure 4 As shown, further, the top of the first sealing protrusion 321 contacts the top of the annular limiting portion 21, and the side of the first sealing protrusion 321 away from the top cover 1 contacts the inner wall of the sealing body portion 31, while the side of the first sealing protrusion 321 near the top cover 1 contacts the outer periphery of the top cover 1. It should be noted that the "top of the first sealing protrusion 321" refers to the end of the first sealing protrusion 321 facing the annular limiting portion 21, that is, the most protruding end of the first sealing protrusion 321 relative to the inner wall of the first bent portion 32.

[0085] In this embodiment, a multi-point sealing mechanism is formed by contacting the top and both sides of the first sealing protrusion 321 with the annular limiting part 21, the sealing body part 31, and the top cover 1, respectively. This multi-point sealing mechanism can significantly improve the overall sealing performance of the sealing ring 3, ensuring that even in complex working environments, it can effectively prevent external substances from entering the battery.

[0086] Understandably, multiple contact points not only increase the physical contact between the sealing ring 3 and each component, but also enhance the stability and deformation resistance of the sealing ring 3 itself. That is, when faced with external factors such as temperature changes and mechanical shocks, the sealing ring 3 can still maintain its sealing effect, improving battery safety and lifespan.

[0087] This design allows the sealing ring 3 to better accommodate dimensional tolerances and material property differences during the manufacturing process, thereby simplifying the assembly process and reducing sealing problems caused by improper assembly. At the same time, it also enables the sealing ring 3 to maintain consistent high performance across different batches of products.

[0088] In summary, in this further specific embodiment of the present invention, by making the top of the first sealing protrusion 321, the side away from the top cover 1, and the side close to the top cover 1 in contact with the annular limiting part 21, the sealing main body part 31, and the top cover 1 respectively, a more tight and reliable sealing effect is achieved, which greatly enhances the sealing performance of the battery cap and the stability of its overall structure.

[0089] like Figure 1 , Figure 3 and Figure 4 As shown, according to some embodiments of the present invention, the first sealing protrusion 321 is interference-fitted with the height difference gap 11. When the sealing ring 3 is in the unassembled state, the height of the height difference gap 11 ranges from 0.05mm to 0.5mm, and the height of the first sealing protrusion 321 ranges from 0.1mm to 0.8mm.

[0090] In this design, the interference fit means that the size of the first sealing protrusion 321 is slightly larger than the size of the height difference gap 11. It fills the gap through slight compression deformation, thereby achieving better sealing performance. This design not only compensates for tolerances during manufacturing but also maintains a stable sealing effect under conditions such as temperature changes or mechanical vibration.

[0091] Regarding the height range of the height difference gap 11 (i.e., 0.05mm-0.5mm): this range takes into account both the precision limitations in actual production and ensures sufficient clearance for the first sealing protrusion 321 to be embedded. Smaller gaps can provide a finer seal, while larger gaps can accommodate larger manufacturing tolerances.

[0092] For the height range of the first sealing protrusion 321 (i.e., 0.1mm-0.8mm): the height selection within this range ensures that even with manufacturing errors, the first sealing protrusion 321 can still effectively embed and seal the height difference gap 11. A higher protrusion can provide a stronger sealing force, but a balance needs to be struck between the elasticity and durability of the material.

[0093] In this way, by precisely controlling the dimensional relationship between the first sealing protrusion 321 and the height difference gap 11, an interference fit is achieved, providing a more reliable sealing effect and ensuring the stability and safety of the battery's internal environment.

[0094] Below is a data comparison table of embodiments and comparative examples of the battery cap based on this utility model. The embodiments include those where the height difference gap 11 is within the range of 0.05mm-0.5mm and the height of the first sealing protrusion 321 is within the range of 0.1mm-0.8mm.

[0095] Table 1

[0096] Group Height difference gap / mm Height of the first sealing protrusion / mm Sealing performance Manufacturing difficulty Example 1 0.05 0.1 middle middle Example 2 0.1 0.2 middle middle Example 3 0.2 0.3 high Low Example 4 0.4 0.5 high Low Example 5 0.5 0.8 high Low Comparative Example 1 0.02 0.05 Low high Comparative Example 2 0.04 0.08 Low high Comparative Example 3 0.6 0.9 Low Low Comparative Example 4 0.7 1.0 Low Low

[0097] As can be seen from the table above, when the height difference gap 11 is within the range of 0.05mm-0.5mm and the height of the first sealing protrusion 321 is within the range of 0.1mm-0.8mm, the battery cap has high sealing performance and low manufacturing difficulty, thus achieving a balance between sealing performance and manufacturing difficulty. However, if the height difference gap 11 and the height of the first sealing protrusion 321 are taken outside the above range, there may be problems such as good sealing performance but excessive manufacturing difficulty, or low manufacturing difficulty but poor sealing performance, thus failing to achieve a balance.

[0098] like Figure 1 , Figure 3 and Figure 4 As shown, according to some embodiments of the present invention, the sealing ring 3 further includes a second bending portion 33, which bends in the direction toward the bottom of the explosion-proof valve 2, and the top surface of the second bending portion 3 is spaced apart from the bottom of the explosion-proof valve 2; a second sealing protrusion 331 is provided on the top surface of the second bending portion 33, and the top of the second sealing protrusion 331 abuts against the bottom of the explosion-proof valve 2.

[0099] It should be explained that the design of the second bend 33 allows the sealing ring 3 to not only cover the height difference gap 11 between the top cover 1 and the explosion-proof valve 2, but also extend to the bottom of the explosion-proof valve 2, providing additional sealing protection. This double-layer bend design significantly enhances the overall sealing performance and structural stability of the sealing ring 3.

[0100] The second sealing protrusion 331 is located on the top surface of the second bend 33, and its top directly abuts against the bottom of the explosion-proof valve 2. This not only increases the contact area between the sealing ring 3 and the explosion-proof valve 2, but also ensures that even under extreme conditions, external substances can be effectively prevented from entering the battery through the bottom.

[0101] Based on the embodiment of the sealing ring 3 structure described in this utility model, it can be understood that this utility model adopts a multi-layer sealing mechanism. The first sealing protrusion 321 is responsible for sealing the height difference gap 11 between the top cover 1 and the explosion-proof valve 2, while the second sealing protrusion 331 provides an additional layer of sealing protection against any small gaps or potential leaks that may exist at the bottom of the explosion-proof valve 2. This multi-layer sealing mechanism greatly improves the sealing reliability of the entire battery cap.

[0102] In summary, the battery cap of this embodiment, by adding a second bend 33 and providing a second sealing protrusion 331 on its inner wall, forms a multi-layered sealing structure, which not only significantly improves the overall sealing performance and structural stability of the sealing ring 3, but also provides stronger protection for the safe operation of the battery.

[0103] like Figure 1 , Figure 3 and Figure 4 As shown, the height of the second sealing protrusion 331 is greater than the distance between the second bend 33 and the explosion-proof valve 2. When the sealing ring 3 is in the unassembled state, the height of the second sealing protrusion 331 ranges from 0.1mm to 0.5mm.

[0104] In this embodiment, by designing the height of the second sealing protrusion 331 to be greater than the distance between the second bend 33 and the explosion-proof valve 2, the second sealing protrusion 331 will undergo slight compression deformation during assembly. This interference fit ensures that the sealing ring 3 and the bottom of the explosion-proof valve 2 form a tight contact, thereby effectively preventing external substances from entering the battery.

[0105] The height of the second sealing protrusion 331 ranges from 0.1mm to 0.5mm. This height range takes into account manufacturing tolerances and the elastic properties of the material. A smaller height provides a finer seal, while a larger height can accommodate greater manufacturing errors while maintaining sufficient sealing force.

[0106] In this way, by precisely controlling the height of the second sealing protrusion 331 to be greater than the distance between the second bend 33 and the explosion-proof valve 2, an effective interference fit is achieved, ensuring that the sealing ring 3 can provide the necessary pressure when embedded in the gap, thereby forming a tight seal. At the same time, the design allows for a certain range of dimensional tolerances, and through the elastic compensation capability of the second sealing protrusion 331, this design scheme has strong adaptability and flexibility, suitable for different batches of products and application scenarios.

[0107] Below is a data comparison table of embodiments and comparative examples of the battery cap based on this utility model. The embodiments include those where the height of the second sealing protrusion 331 is within the range of 0.1mm-0.5mm.

[0108] Table 2

[0109] Group Height of the second sealing protrusion / mm Sealing performance Manufacturing difficulty Example 1 0.1 middle Low Example 2 0.2 middle Low Example 3 0.3 high middle Example 4 0.5 high middle Comparative Example 1 0.05 Low high Comparative Example 2 0.6 high high Comparative Example 3 1.0 high high

[0110] As can be seen from the table above, when the height of the second sealing protrusion 331 is within the range of 0.1mm-0.5mm, the battery cap has high sealing performance and low manufacturing difficulty, thus achieving a balance between sealing performance and manufacturing difficulty. However, if the height of the second sealing protrusion 331 is taken outside the above range, there may be problems such as good sealing performance but excessive manufacturing difficulty, or low manufacturing difficulty but poor sealing performance, thus failing to achieve a balance.

[0111] like Figure 1 , Figure 3 and Figure 4 As shown, a fitting gap is further formed between the second sealing protrusion 331, the sealing body 31 and the explosion-proof valve 2, and the fitting gap is filled with structural adhesive 4.

[0112] It should be noted that although the height of the second sealing protrusion 331 is greater than the distance between the second bend 33 and the explosion-proof valve 2, thus achieving an interference fit, there may still be tiny gaps or incomplete contact during actual manufacturing and assembly. These tiny gaps, if not properly addressed, could become potential leakage points. Therefore, to address these defects, this embodiment effectively fills any tiny gaps by filling these mating gaps with structural adhesive 4, ensuring the integrity of the entire sealing system. This additional sealing layer significantly improves waterproofing, dustproofing, and other performance characteristics, preventing external substances from entering the battery.

[0113] It is understandable that structural adhesive 4 not only provides a sealing function but also enhances the mechanical connection strength between the sealing ring 3 and the explosion-proof valve 2, thereby helping to improve the overall structural stability and impact resistance, and reducing the risk of seal failure due to external vibration or impact. Furthermore, structural adhesive 4 typically possesses excellent weather resistance and chemical corrosion resistance, maintaining its performance over a wide temperature range. Thus, even when operating in extreme environments, the sealing system can maintain good condition for a long time.

[0114] In summary, this embodiment, based on the original first sealing protrusion 321 and second sealing protrusion 331, forms a more complex and reliable multi-layer sealing mechanism through the filling of structural adhesive 4. This design not only compensates for any potential minor defects but also provides an additional protective barrier, ensuring the stability and safety of the battery's internal environment.

[0115] According to some embodiments of this utility model, the sealing ring 3 can be made of PBT material, but the material of the sealing ring 3 can also be PP, PC, fluororubber, etc. PBT stands for Polybutylene Terephthalate; PP stands for Polypropylene; PC stands for Polycarbonate. Fluororubber is also known as Fluoroelastomer.

[0116] It is understandable that choosing the right material can ensure the optimal performance and reliability of the sealing ring 3 under specific conditions.

[0117] like Figure 1 , Figure 3 and Figure 4 As shown, according to some embodiments of this utility model, the battery cap further includes a perforated plate 5 and an insulating ring 6. The perforated plate 5 is fixed below the explosion-proof valve 2. The central portion of the perforated plate 5 forms a thinned first connecting portion, and correspondingly, the central portion of the explosion-proof valve 2 forms a downwardly recessed second connecting portion. The first and second connecting portions are fixedly connected by laser welding. An insulating ring 6 is sandwiched between the outer periphery of the perforated plate 5 and the explosion-proof valve 2. The lower surface of the perforated plate 5 is welded to the tabs inside the cell assembly 8.

[0118] In this way, the use of insulating ring 6 effectively isolates the electrical connection between orifice plate 5 and explosion-proof valve 2, preventing the risk of current leakage or short circuit, and further improving the safety and reliability of the battery.

[0119] like Figure 2 and Figure 3 As shown, the battery according to the second aspect embodiment of the present invention includes a battery cap as described in the first aspect embodiment of the present invention, and also includes a battery housing 7 and a cell assembly 8. The cell assembly 8 is installed inside the battery housing 7, and the battery cap covers the top of the battery housing 7. The battery housing 7 presses the sealing ring 3 against the outer surface of the top cover 1 and the explosion-proof valve 2.

[0120] For example, the battery cap includes a top cover 1, an explosion-proof valve 2, and a sealing ring 3. The sealing ring 3 further includes a sealing body portion 31, a first bend portion 32, and a second bend portion 33, wherein the first sealing protrusion 321 and the second sealing protrusion 331 respectively provide effective sealing for the height difference gap 11 and the bottom of the explosion-proof valve 2.

[0121] The battery casing 7 is the outer shell of the battery, usually made of metal. Inside it is installed the cell assembly 8, which typically includes key components such as positive and negative electrode materials, separators, and electrolytes.

[0122] A battery cap is positioned on top of the battery housing 7 to ensure isolation between the battery's interior and the external environment. Specifically, the battery housing 7 presses the sealing ring 3 firmly against the outer surfaces of the top cover 1 and the explosion-proof valve 2, thereby enhancing the reliability of the entire sealing system. The sealing ring 3, pressed firmly against the outer surfaces of the top cover 1 and the explosion-proof valve 2 by the battery housing 7, ensures a good seal even during long-term use. This design not only prevents external substances (such as moisture and dust) from entering the battery but also ensures that internal gas does not leak out.

[0123] In summary, according to the battery embodiment of this utility model, the sealing ring 3 is tightly fitted to the outer surfaces of the top cover 1 and the explosion-proof valve 2 by the pressing action of the battery casing 7, effectively preventing external substances from entering the battery or internal substances from leaking out. At the same time, the pressing action not only enhances the sealing effect but also improves the stability of the entire structure, reducing the risk of seal failure due to external impacts or vibrations.

[0124] Furthermore, the above design allows the position and pressure distribution of the sealing ring 3 to be automatically adjusted by the clamping action of the battery casing 7 during the assembly process, simplifying the assembly steps and reducing the possibility of human error.

[0125] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A battery cap, characterized in that, include: Top cover (1) and explosion-proof valve (2), the top cover (1) is placed on top of the explosion-proof valve (2), and there is a height difference between the outer periphery of the top cover (1) and the outer periphery of the explosion-proof valve (2) and a height difference gap (11) is formed; A sealing ring (3) is fitted on the outside of the top cover (1) and the explosion-proof valve (2), and a first sealing protrusion (321) is provided on the inner wall of the sealing ring (3). The first sealing protrusion (321) fits into the height difference gap (11) and seals it.

2. The battery cap according to claim 1, characterized in that, The outer periphery of the explosion-proof valve (2) is bent in the direction toward the top cover (1) to form an annular limiting part (21). The annular limiting part (21) is disposed around the top cover (1) and is lower than the outer periphery of the top cover (1). The height difference gap (11) is formed between the top of the annular limiting part (21) and the outer periphery of the top cover (1).

3. The battery cap according to claim 2, characterized in that, The sealing ring (3) includes a sealing body (31) and a first bending part (32). The sealing body (31) is sleeved on the outside of the annular limiting part (21). The first bending part (32) is bent in the direction toward the top of the top cover (1) and attached to the top of the top cover (1). The first sealing protrusion (321) is disposed on the inner wall of the sealing body (31) or on the inner wall of the first bent portion (32).

4. The battery cap according to claim 3, characterized in that, The first sealing protrusion (321) is disposed on the inner wall of the first bend (32) and extends in a direction toward the top of the annular limiting portion (21).

5. The battery cap according to claim 4, characterized in that, The end of the first sealing protrusion (321) facing the annular limiting portion (21) is in contact with the top of the annular limiting portion (21), and the side of the first sealing protrusion (321) away from the top cover (1) is in contact with the inner wall of the sealing body portion (31), and the side of the first sealing protrusion (321) near the top cover (1) is in contact with the outer periphery of the top cover (1).

6. The battery cap according to claim 4, characterized in that, The first sealing protrusion (321) is press-fitted with the height difference gap (11). When the sealing ring (3) is in the unassembled state, the height of the height difference gap (11) ranges from 0.05mm to 0.5mm, and the height of the first sealing protrusion (321) ranges from 0.1mm to 0.8mm.

7. The battery cap according to any one of claims 3 to 6, characterized in that, The sealing ring (3) further includes a second bend (33), which bends toward the bottom of the explosion-proof valve (2), and the top surface of the second bend (33) is spaced apart from the bottom of the explosion-proof valve (2). Furthermore, a second sealing protrusion (331) is provided on the top surface of the second bending part (33), and the top of the second sealing protrusion (331) abuts against the bottom of the explosion-proof valve (2).

8. The battery cap according to claim 7, characterized in that, The height of the second sealing protrusion (331) is greater than the distance between the second bend (33) and the explosion-proof valve (2). When the sealing ring (3) is in the unassembled state, the height of the second sealing protrusion (331) ranges from 0.1mm to 0.5mm.

9. The battery cap according to claim 7, characterized in that, A fitting gap is formed between the second sealing protrusion (331), the sealing body (31), and the explosion-proof valve (2), and the fitting gap is filled with structural adhesive (4).

10. A battery, characterized in that, include: Battery cap as described in any one of claims 1 to 9; The battery housing (7) and the cell assembly (8) are installed inside the battery housing (7) and the battery cap is placed on the top of the battery housing (7). The battery housing (7) presses the sealing ring (3) against the outer surface of the top cover (1) and the explosion-proof valve (2).

Images