Battery sealing device and secondary battery comprising same

Abstract

The utility model belongs to the technical field of batteries, and mainly relates to a battery sealing device which comprises a battery top cover and a sealing element, the sealing element is assembled in a liquid injection hole of the battery top cover and comprises a first part and a second part, and the liquid injection hole is provided with a step part and a first cavity; the diameter of the first part is D1, a second cavity used for containing the first part is defined by the step part, the inner diameter of the second cavity is D2, and the first part and the second cavity meet the condition that D1 is smaller than or equal to D2; the second part is assembled in the first cavity in an interference mode, the inner diameter of the first cavity is D3, and the first part and the first cavity meet the condition that D2 is larger than D3; wherein the first part is used for realizing first-layer sealing on the battery top cover, and the second part is used for realizing second-layer sealing on the battery top cover, so that the risk that the electrolyte permeates into the liquid injection hole to cause aging and falling of the sealing glue nail is reduced, and the service life of the battery is prolonged; meanwhile, the utility model designs the secondary battery comprising the battery sealing device, and the sealing strength of the battery is further improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the battery technical field, and specifically relates to a battery sealing device and a secondary battery comprising the device. BACKGROUND

[0002] In the field of modern electronic devices, batteries play a crucial role as the core energy supply component, and their performance directly determines the stability and service life of the device. The sealing performance of the battery top cover is one of the key factors to ensure the safe operation and prolong the service life of the battery. However, traditional battery sealing methods have limitations, such as loose sealing that may cause electrolyte leakage, and sealing failure when the battery internal gas expands. To address these issues, the skilled person in the art found that using a sealing glue nail to close the liquid injection hole can effectively prevent electrolyte from overflowing from the liquid injection hole. Therefore, the sealing glue nail has gradually become the preferred solution for the sealing structure of the battery top cover.

[0003] In reviewing the current industry situation, the present application notes that the sealing glue nail is generally a standard part, with consistent structure and size. However, these sealing glue nails have a significant defect: they gradually age and even fall off under long-term electrolyte immersion.

[0004] Based on this, there is an urgent need to improve the existing battery sealing device and the secondary battery comprising the device to address the aforementioned technical deficiencies. SUMMARY

[0005] One of the purposes of the utility model is to provide a battery sealing device that can prevent the aging of sealing glue nails to address the deficiencies of the prior art.

[0006] To achieve the above technical purpose, the present application implements the following technical solutions:

[0007] A battery sealing device, comprising a battery top cover and a sealing element, the sealing element is assembled in the liquid injection hole of the battery top cover, wherein the sealing element comprises a first part and a second part, the liquid injection hole is provided with a stepped portion and a first cavity; the diameter of the first part is D1, the stepped portion surrounds a second cavity for accommodating the first part, the inner diameter of the second cavity is D2, the first part and the second cavity satisfy: D1≤D2; the second part is interference-fitted in the first cavity, the inner diameter of the first cavity is D3, the first part and the first cavity satisfy: D2>D3.

[0008] The above technical solution produces the following technical effects:

[0009] The application improves the sealing performance of the battery top cover by setting the sealing member with a specific structure (double-layer sealing can be achieved), effectively avoids the problems of electrolyte leakage and sealing failure when the gas expands. At the same time, thanks to the improvement of the sealing member, the sealing member is divided into a first part for achieving the first layer sealing and a second part for achieving the second layer sealing, which effectively reduces the risk of electrolyte immersion into the liquid injection hole due to external force during actual use, thereby prolonging the service life of the battery.

[0010] As a further improvement of the battery sealing device of the application, the first cavity and the second cavity are coaxially arranged, and the depth of the second cavity is greater than the thickness of the first part.

[0011] As a further improvement of the battery sealing device of the application, it further comprises a pressing member;

[0012] Further, the pressing member is assembled in the second cavity of the step part, one side of the pressing member abuts against the first part, and the other side is flush with the step surface of the step part.

[0013] As a further improvement of the battery sealing device of the application, the diameter of the second cavity gradually increases away from the first cavity.

[0014] As a further improvement of the battery sealing device of the application, the abutting groove is arranged at the abutting position of the pressing member and the first part, and the first part is assembled in the abutting groove, and the abutting surface of the abutting groove presses the first part.

[0015] As a further improvement of the battery sealing device of the application, the step part is connected with the first cavity through a transition part, and the transition part is provided with a third cavity, and the diameter of the third cavity is the same as that of the first part.

[0016] As a further improvement of the battery sealing device of the application, the depth of the transition part is less than or equal to the thickness of the first part.

[0017] As a further improvement of the battery sealing device of the application, the sealing member further comprises a third part arranged at one end of the second part away from the first part, and the third part is provided with an end part.

[0018] Further, the diameter of the end part gradually decreases away from the second part.

[0019] As a further improvement of the battery sealing device of the application, the third part is provided with at least one guide part, and the guide parts are arranged at intervals along the circumference direction of the third part.

[0020] The second purpose of the utility model is to provide a secondary battery capable of preventing the aging of the sealing glue nail.

[0021] In order to achieve the above technical purpose, the application implements the following technical scheme:

[0022] A secondary battery comprising the battery sealing device of any one of the above.

[0023] The technical scheme has the following technical effects:

[0024] The secondary battery provided with the battery sealing device has a sealing member designed to significantly reduce the risk of electrolyte seepage into the liquid injection hole due to external force during long-term use. This improvement effectively reduces the aging and falling of the sealing glue nails, thereby prolonging the service life of the battery. BRIEF DESCRIPTION OF DRAWINGS

[0025] The accompanying drawings, which are included to provide a further understanding of the present application and constitute a part of this application, illustrate embodiments of the present application and together with the description serve to explain the present application. In the drawings:

[0026] Figure 1 Structure diagram of the sealing member in embodiment 1 of the present application;

[0027] Figure 2 Structure diagram of the sealing member in embodiment 1 of the present application;

[0028] Figure 3 Structure diagram of the sealing member in embodiment 1 of the present application; Figure 2 Sectional view along A-A;

[0029] Figure 4 Structure diagram of the sealing member in embodiment 1 of the present application;

[0030] Figure 5 Structure diagram of the sealing member in embodiment 4 of the present application;

[0031] Wherein:

[0032] 1 - battery top cover;

[0033] 11 - liquid injection hole;

[0034] 111 - step portion;

[0035] 1111 - second cavity;

[0036] 1112 - step surface;

[0037] 112 - first cavity;

[0038] 113 - transition portion;

[0039] 1131 - third cavity;

[0040] 2 - sealing member;

[0041] 21 - first portion;

[0042] 22 - second portion;

[0043] 23 - third portion;

[0044] 231 - end portion;

[0045] 232 - guide portion;

[0046] 3 - pressing member;

[0047] 31 - abutting groove. DETAILED DESCRIPTION

[0048] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application. Unless otherwise defined, all the technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present application belongs. The terms used in the specification of the present application are only for the purpose of describing the specific embodiments of the present application, and are not intended to limit the present application.

[0049] In the description of the present application, unless otherwise explicitly defined and limited, the terms "mounting", "connection", "connecting", "fixing" should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integrated; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0050] Although the present application is disclosed with the preferred embodiments as above, it is not intended to limit the claims, and any person skilled in the art can make several possible changes and modifications without departing from the concept of the present application, therefore the protection scope of the present application should be limited by the scope defined by the claims of the present application.

[0051] The present application will be described in further detail below in conjunction with the specific embodiments, but the embodiments of the present application are not limited thereto.

[0052] Embodiment 1

[0053] As Figures 1-4As shown, in order to improve the sealing effect of the liquid injection hole 11 in the battery top cover 1, the present application improves the existing battery sealing device, aiming to realize double-layer sealing so that the electrolyte will not be immersed in the sealing glue nail (the sealing member 2 in the present application can be a glue nail material, including but not limited to a sealing glue nail, and the sealing member 2 will be explained in the present application to facilitate comparison with the sealing glue nail of the prior art) during the actual work of the battery. Specifically, the battery sealing device of the present application comprises a battery top cover 1 and a sealing member 2, the sealing member 2 is assembled in the liquid injection hole 11 of the battery top cover 1, wherein the sealing member 2 comprises a first part 21 and a second part 22, the liquid injection hole 11 is provided with a stepped portion 111 and a first cavity 112; the diameter of the first part 21 is D1, the stepped portion 111 is provided with a second cavity 1111 for accommodating the first part 21, the inner diameter of the second cavity 1111 is D2, the first part 21 and the second cavity 1111 satisfy: D1≤D2; the second part 22 is assembled in the first cavity 112 in interference, the inner diameter of the first cavity 112 is D3, the first part 21 and the first cavity 112 satisfy: D2>D3.

[0054] Specifically, the working principle of the present application is that the first part 21 of the sealing member 2 of the present application can cover the first cavity 112 of the stepped portion 111, so that the space near the stepped portion 111 of the first cavity 112 is sealed. Wherein the first part 21 is preferably cylindrical, the thickness of the first part 21 is the height of the cylinder, and the diameter D1 of the first part 21 is the diameter of the upper and lower sections of the cylinder. Since the diameter D1 of the first part 21 is greater than the diameter D3 of the first cavity 112, the space near the stepped portion 111 of the first cavity 112 is sealed. At the same time, in the specific implementation process, the cylinder can be beneficial to the technician when sealing the liquid injection hole 11 by the sealing member 2 of the present application, so as to increase the sealing effect of the first layer sealing of the first part 21 to the liquid injection hole 11.

[0055] Further, the second cavity 1111 is surrounded by the stepped portion 111, and the second cavity 1111 is designed to assemble the sealing member 2, so that the second part 22 can penetrate the second cavity 1111 and be in interference fit with the first cavity 112 to form a second layer sealing. At the same time, the second cavity 1111 provides a space for accommodating the first part 21, so that the first part 21 can cover the outside of the first cavity 112 in the second cavity 1111. Further, the inner diameter of the first cavity 112 is greater than the first part 21, which is considered that the first cavity 112 may also cover other sealing materials, and only when the first part 21 completely covers and is clamped on the outside of the first cavity 112, the technician can realize the first layer sealing by pressing the first part 21, and the diameter of the first part 21 is designed to be smaller than the inner diameter of the first cavity 112, which can further save materials on the premise of realizing the technical purpose of the present application.

[0056] Further, the first cavity 112 is coaxially arranged with the second cavity 1111, thereby ensuring the accuracy of the assembly of the sealing member 2 and the reliability of the sealing effect. During the assembly process, the outer diameter of the second part 22 matches the inner diameter of the first cavity 112, ensuring the tightness of the interference fit, so that when the second part 22 passes through the second cavity 1111, an effective second layer seal can be formed with the first cavity 112. Further, the depth of the second cavity 1111 is greater than the thickness of the first part 21, so that the first part 21 will reserve a position for other sealing materials to fill, while the sealing member 2 will not affect the sealing effect of the battery cover plate at the position of the liquid injection hole 11 after sealing the liquid injection hole 11.

[0057] Further, the sealing member 2 of the present application also includes a pressing member 3; the pressing member 3 is assembled in the second cavity 1111 of the stepped part 111, one side of the pressing member 3 abuts against the first part 21, and the other side is flush with the stepped surface 1112 of the stepped part 111. It should be noted that in the present application, the pressing member 3 is generally an aluminum nail, and its working purpose is to press the first part 21 of the sealing member 2 while ensuring that there is no excess gap in the second cavity 1111. Through the design of the pressing part, the tight combination between the sealing member 2 and the battery top cover 1 is further ensured, thereby improving the sealing effect. The use of the pressing member 3 not only enhances the stability of the sealing member 2, but also provides additional elasticity and adaptability due to the expansion or contraction of the material caused by temperature changes during the charging and discharging process of the battery, ensuring that the sealing effect is not affected.

[0058] Further, the diameter of the second cavity 1111 gradually increases away from the first cavity 112, thereby ensuring that the second part 22 can smoothly pass through the second cavity 1111 during assembly, and that unnecessary pressure or damage will not be caused to the first part 21 of the sealing member 2 during the assembly process. This design not only improves the convenience of assembly, but also helps to maintain the structural integrity and sealing performance of the sealing member 2.

[0059] In summary, the battery sealing device provided by the present application improves the sealing performance of the battery through its unique double-layer sealing design, and has good assembly convenience and adaptability, providing a reliable and practical sealing solution for secondary batteries.

[0060] Embodiment 2

[0061] As Figures 1-4As shown, the difference from embodiment 1 is that: in order to further reflect the pressing effect of the pressing member 3 of the present application on the first part 21, specifically, an abutment groove 31 is provided at the abutment point between the pressing part and the first part 21, and the first part 21 is assembled in the abutment groove 31, and the abutment surface of the abutment groove 31 is pressed against the first part 21. The design of the abutment groove 31 further ensures the contact area between the pressing member 3 and the first part 21, thereby improving the pressing effect. At the same time, the design of the abutment groove 31 can also reduce the pressure concentration of the pressing member 3 on the surface of the first part 21, avoiding damage to the seal 2 during the pressing process. In addition, the shape and size of the abutment groove 31 can be optimized according to actual needs to adapt to seals 2 of different sizes and shapes, thereby improving the versatility and adaptability of the utility model.

[0062] Other details that are the same as those in Implementation 1 will not be repeated in this application.

[0063] Implementation 3

[0064] like Figures 1-4 As shown, the difference from Embodiment 1 is that, to further enhance the sealing effect of the first portion 21, the step portion 111 is connected to the first cavity 112 via a transition portion 113. The transition portion 113 is provided with a third cavity 1131, the diameter of which is the same as that of the first portion 21. The design of the transition portion 113 allows for partial or complete retention of the first portion 21 within the third cavity 1131. When the first portion 21 is partially retained within the third cavity 1131, the portion of the first portion 21 away from the third cavity 1131 is engaged by the abutment groove 31 of the pressing portion, thereby further enhancing the sealing effect. This not only ensures a tight fit between the first portion 21 and the step portion 111, but also, by aligning the diameter of the third cavity 1131 with that of the first portion 21, positions and secures the first portion 21. This design enhances the stability of the first portion 21 during assembly, reducing the risk of damage to the seal 2 or reduced sealing performance due to improper assembly.

[0065] Furthermore, when the entire first portion 21 is secured within the third cavity 1131, the compression member 3 can compress the first portion 21 without requiring the abutment groove 31. This design not only simplifies the structure of the compression member 3 but also reduces the complexity of the assembly process, thereby improving production efficiency. Furthermore, the positioning and securing provided by the third cavity 1131 ensures the stability of the seal 2 during battery assembly, further enhancing the overall sealing performance of the battery.

[0066] In summary, the battery sealing device provided by the application improves the sealing performance of the battery, has good assembly convenience and adaptability, and provides a reliable and practical sealing solution for the secondary battery.

[0067] Other than the same as embodiment 1, the application will not be repeated.

[0068] Embodiment 4

[0069] As Figures 1-5 shown, different from embodiment 1 is: in order to further improve the sealing effect of the sealing piece 2 of the application, specifically, the sealing piece 2 further includes a third part 23 arranged at one end of the second part 22 away from the first part 21, and the third part 23 is provided with an end part 231; the radius of the end part 231 gradually decreases away from the second part 22. The design of the end part 231 makes the sealing piece 2 more easily enter the liquid injection hole 11, so that the second part 22 is in interference fit with the first cavity 112.

[0070] Further, the third part 23 is provided with at least one guide part 232, and the guide part 232 is arranged at intervals along the circumference direction of the third part 23. The design of the guide part 232 makes the guide part 232 guide the second part 22 to smoothly pass through the second cavity 1111 and the first cavity 112 during assembly, ensuring the accuracy of assembly. The arrangement of the guide part 232 not only improves the assembly convenience, but also helps to maintain the structural integrity and sealing performance of the sealing piece 2. In addition, the design of the gradually decreasing radius of the end part 231 of the third part 23 makes the sealing piece 2 more smoothly enter the liquid injection hole 11 during assembly, so as to realize the interference fit with the first cavity 112, and further enhance the sealing effect.

[0071] In summary, the battery sealing device provided by the application improves the sealing performance of the battery, has good assembly convenience and adaptability, and provides a reliable and practical sealing solution for the secondary battery.

[0072] Other than the same as embodiment 1, the application will not be repeated.

[0073] Further, the application also designs a secondary battery, which comprises the battery sealing device in any of the above embodiments 1-4. The structure design not only ensures the safety and stability of the battery during charging and discharging, but also improves the overall performance of the battery. The positive and negative materials of the secondary battery are connected with the external circuit through the conductor, so that the battery can output electric energy. The electrolyte in the battery provides the necessary medium for the electrochemical reaction, and the battery sealing device ensures that the electrolyte does not leak, and prevents the moisture and impurities in the external environment from entering the battery, affecting the performance of the battery. At the same time, the double-layer sealing of the liquid injection hole 11 in the secondary battery is realized through the sealing element 2 in the battery sealing device, which ensures the reliability of the battery in various working environments.

[0074] The above is only the preferred embodiment of the application and is not used to limit the application. For those skilled in the art, the application can have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the application shall be included in the protection scope of the application.

Claims

1. A battery sealing device comprising a battery top cover (1) and a seal member (2) fitted in a liquid injection hole (11) of the battery top cover (1), characterized in that, The sealing member (2) comprises a first part (21) and a second part (22), and the liquid injection hole (11) is provided with a stepped part (111) and a first cavity (112); The first part (21) has a diameter D1, the stepped part (111) is provided with a second cavity (1111) for accommodating the first part (21), the second cavity (1111) has an inner diameter D2, and the first part (21) and the second cavity (1111) satisfy D1≤D2; The second part (22) is interference-fitted in the first cavity (112), the first cavity (112) has an inner diameter D3, and the first part (21) and the first cavity (112) satisfy D2>D3.

2. A battery sealing device according to claim 1, wherein The first cavity (112) and the second cavity (1111) are coaxially arranged, and the depth of the second cavity (1111) is greater than the thickness of the first part (21).

3. A battery sealing device according to claim 2, wherein Further comprising a compression member (3); The compression member (3) is fitted in the second cavity (1111) of the stepped part (111), one side of the compression member (3) abuts against the first part (21), and the other side is flush with the stepped surface (1112) of the stepped part (111).

4. A battery sealing device according to claim 3, wherein The diameter of the second cavity (1111) gradually increases away from the first cavity (112).

5. A battery sealing device according to claim 3, wherein The compression member (3) is provided with an abutting groove (31) at the abutting position with the first part (21), the first part (21) is fitted in the abutting groove (31), and the first part (21) is compressed by the abutting surface (311) of the abutting groove (31).

6. A battery sealing device according to claim 2, wherein The stepped part (111) and the first cavity (112) are connected through a transition part (113), the transition part (113) is provided with a third cavity (1131), and the diameter of the third cavity (1131) is the same as the diameter of the first part (21).

7. A battery sealing device according to claim 6, wherein The depth of the transition part (113) is less than or equal to the thickness of the first part (21).

8. The battery sealing apparatus of claim 1, wherein The sealing member (2) further comprises a third part (23) provided at one end of the second part (22) away from the first part (21), and the third part (23) is provided with an end part (231); The diameter of the end part (231) gradually decreases away from the second part (22).

9. A battery sealing device according to claim 8, wherein The third part (23) is provided with at least one guide part (232), and the guide parts (232) are arranged at intervals along the circumferential direction of the third part (23).

10. A secondary battery characterized by comprising: The battery sealing device comprises the sealing device according to any one of claims 1-9.

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