Cap assembly and battery

Abstract

The utility model provides a cap assembly and a battery, the cap assembly comprises: a first sealing member having a bearing portion; the top cover is arranged in the first sealing piece, the top cover is provided with a first cover body and a second cover body which are sequentially connected from bottom to top in the radial direction of the top cover, the end face part, away from the second cover body, of the first cover body is connected with the bearing part, and the side, away from the bearing part, of the second cover body protrudes out; the anti-explosion piece is arranged in the first sealing piece, the anti-explosion piece is connected with the end face, away from the second cover body, of the first cover body, a gap is formed between the anti-explosion piece and the bearing part, and the diameter of the anti-explosion piece is smaller than the inner diameter of the bearing part. By applying the technical scheme of the utility model, the technical problem of large occupied space of the cap structure can be improved.

Description

Technical Field

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

[0002] Lithium-ion batteries have advantages such as high energy density, fast charging and discharging, long cycle life, and no pollution, and have been widely used in portable electronic devices, communications, energy storage, and electric vehicles.

[0003] Cylindrical batteries consist of a cap structure, a casing, and battery cells. The cap structure includes a top cover, seals, and an explosion-proof diaphragm. The cap structure has many components and is relatively tall. Given a fixed battery height, the cap structure is typically a semi-enclosed design, requiring the seals to support the top cover and explosion-proof diaphragm. This results in a relatively tall seal, leading to a high shoulder height and occupying a significant amount of space in the battery's height direction. This can compress the electrode plates, potentially damaging their structure and hindering the improvement of cell capacity. Utility Model Content

[0004] The present invention provides a cap assembly and a battery, which can improve the technical problem of large space occupation of the cap structure.

[0005] In a first aspect, embodiments of the present invention provide a cap assembly, the cap assembly comprising: a first sealing member having a receiving portion; a top cover disposed within the first sealing member, the top cover having a first cover body and a second cover body sequentially connected from bottom to top along the radial direction of the top cover, the end face portion of the first cover body away from the second cover body being connected to the receiving portion; and an explosion-proof sheet disposed within the first sealing member, the explosion-proof sheet being connected to the end face of the first cover body away from the second cover body, the explosion-proof sheet having a gap with the receiving portion and the diameter of the explosion-proof sheet being smaller than the inner diameter of the receiving portion.

[0006] In one embodiment, the first sealing element further includes: a body having a sealing chamber, with a top cover and an explosion-proof sheet both disposed within the sealing chamber; a protruding structure disposed circumferentially on the inner wall of the body, the protruding structure forming a receiving portion; wherein one end of the body can be bent toward the side of the protruding structure to form an accommodating space together with the protruding structure, the periphery of the first cover is located within the accommodating space, and the end face of the first cover away from the second cover is connected to the protruding structure.

[0007] In one embodiment, the height of the first cover is H1, where 0.3mm ≤ H1 ≤ 0.8mm.

[0008] In one embodiment, the cap assembly further includes a second seal disposed between the explosion-proof sheet and the first cover to seal the gap between the explosion-proof sheet and the first cover.

[0009] In one embodiment, a sealing groove is provided on the explosion-proof sheet and / or the first cover, and a second sealing element is disposed in the sealing groove.

[0010] In one embodiment, the depth of the sealing groove in the axial direction of the explosion-proof sheet is H2, where 0.05mm≤H2≤0.25mm.

[0011] In one embodiment, a welding structure is provided between the explosion-proof sheet and the first cover, and a welding structure is provided circumferentially on the outer periphery and / or inner periphery of the second sealing member. The welding structure is used to seal the gap between the explosion-proof sheet and the first cover.

[0012] In one embodiment, the second seal includes a sealing ring.

[0013] In one embodiment, the second cover protrudes toward the side away from the receiving portion.

[0014] In one embodiment, the first seal has a edging structure on the side away from the top cover, the edging structure being used to electrically insulate the orifice plate of the cap assembly from external components.

[0015] Secondly, embodiments of the present invention provide a battery, which includes the aforementioned cap assembly.

[0016] By applying the technical solution of this utility model, a cover body is connected to a receiving part, and an explosion-proof sheet is connected to the end face of the first cover body away from the second cover body. This eliminates the need for a rimmed structure at the edge of the top cover, and there is a gap between the explosion-proof sheet and the receiving part, with the diameter of the explosion-proof sheet being smaller than the inner diameter of the receiving part. This eliminates the need for the explosion-proof sheet to contact the receiving part, thus eliminating the need for the receiving part to support the explosion-proof sheet. The receiving part only supports the first cover body, effectively reducing the shoulder height of the cap assembly and consequently reducing the space occupied in the height direction of the battery. This prevents compression of the electrode plates, thus reducing the risk of damage to the electrode plate structure and improving the cell capacity. Attached Figure Description

[0017] 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 based on these drawings without creative effort.

[0018] Figure 1 This is a perspective view of the cap assembly provided in an embodiment of the present utility model;

[0019] Figure 2 This is a top view schematic diagram of the cap assembly provided in an embodiment of this utility model;

[0020] Figure 3 yes Figure 2 Schematic diagram of the cross section at point AA;

[0021] Figure 4 This is a top view schematic diagram of the explosion-proof sheet provided in an embodiment of this utility model;

[0022] Figure 5 yes Figure 4 A cross-sectional view of section BB.

[0023] The above figures include the following reference numerals:

[0024] 10. First sealing element; 11. Body; 12. Sealing chamber; 13. Protruding structure; 14. Receiving space; 15. Receiving part;

[0025] 20. Top cover; 21. First cover body; 22. Second cover body;

[0026] 30. Explosion-proof sheet; 31. Sealing groove;

[0027] 40. Second sealing element. Detailed Implementation

[0028] 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 protection scope of the present utility model.

[0029] like Figures 1 to 5 As shown, in a first aspect, an embodiment of the present invention provides a cap assembly, the cap assembly comprising: a first sealing member 10 having a receiving portion 15; a top cover 20 disposed within the first sealing member 10, the top cover 20 having a first cover body 21 and a second cover body 22 connected sequentially from bottom to top along the radial direction of the top cover 20, the end face portion of the first cover body 21 away from the second cover body 22 being connected to the receiving portion 15; and an explosion-proof sheet 30 disposed within the first sealing member 10, the explosion-proof sheet 30 being connected to the end face of the first cover body 21 away from the second cover body 22, the explosion-proof sheet 30 having a gap with the receiving portion 15 and the diameter of the explosion-proof sheet 30 being smaller than the inner diameter of the receiving portion 15.

[0030] By applying the technical solution of this utility model, the first cover 21 is connected to the receiving part 15, and the explosion-proof piece 30 is connected to the end face of the first cover 21 away from the second cover 22. This allows the edge of the top cover 20 to be free of edging structure, and there is a gap between the explosion-proof piece 30 and the receiving part 15, with the diameter of the explosion-proof piece 30 being smaller than the inner diameter of the receiving part 15. This eliminates the need for the explosion-proof piece 30 to contact the receiving part 15, thus eliminating the need for the receiving part 15 to receive the explosion-proof piece 30. This allows the receiving part 15 to receive only the first cover 21, effectively reducing the shoulder height of the cap assembly, thereby reducing the space occupied in the height direction of the battery, preventing compression of the electrode sheets, and thus reducing the risk of damage to the electrode sheet structure, which is beneficial to improving the capacity of the battery cell.

[0031] In one embodiment, the first sealing element 10 further includes: a body 11 having a sealing chamber 12, with a top cover 20 and an explosion-proof sheet 30 both disposed within the sealing chamber 12; and a protruding structure 13 disposed circumferentially on the inner wall of the body 11, the protruding structure 13 forming a receiving portion 15; wherein the body 11 can be bent toward the side of the protruding structure 13 to form a receiving space 14 together with the protruding structure 13, the periphery of the first cover 21 is located within the receiving space 14, and the end face of the first cover 21 away from the second cover 22 is connected to the protruding structure 13. By setting the above structure, the first cover 21 can be received and fixed, and the structural strength requirements of the first sealing element 10 can be met, while also taking into account the deformation sealing requirements of the support platform.

[0032] In one embodiment, the height of the first cover 21 is H1, where 0.3mm ≤ H1 ≤ 0.8mm. Optionally, H1 can be set to 0.4mm, 0.5mm, or 0.8mm, etc., which can meet the structural strength requirements of the first cover 21 while also taking into account the usage requirements of the first cover 21.

[0033] In one embodiment, the cap assembly further includes a second seal 40 disposed between the explosion-proof plate 30 and the first cover 21 to seal the gap between them. The second seal 40 fills the minute gaps between the explosion-proof plate 30 and the first cover 21, effectively preventing leakage. Simultaneously, the second seal 40 also prevents external dust, moisture, and other impurities from entering the structure, thereby protecting components from contamination and damage, maintaining the normal operation of the cap assembly, and extending its service life.

[0034] In one embodiment, a sealing groove 31 is provided on the explosion-proof plate 30 and / or the first cover 21, and the second seal 40 is disposed within the sealing groove 31. The sealing groove 31 provides a stable installation position for the second seal 40, ensuring a tight fit between the second seal 40 and adjacent components. Through the filling of sealing material, the sealing groove 31 can effectively prevent leakage, thereby improving the sealing performance of the second seal 40. Furthermore, the design of the sealing groove 31 makes the second seal 40 less prone to loosening or falling off after installation, enhancing the stability and reliability of the sealing system. Even in harsh environments such as high pressure, high temperature, or vibration, the sealing groove 31 can ensure the firmness and durability of the second seal 40. The design of the sealing groove 31 makes the installation of the second seal 40 simple and quick, reducing installation difficulty and cost. When the second seal 40 needs to be replaced, simply remove the old second seal 40 from the sealing groove 31 and install the new second seal 40; no large-scale disassembly of the entire sealing system is required.

[0035] In one embodiment, the groove depth of the sealing groove 31 in the axial direction of the explosion-proof sheet 30 is H2, where 0.05mm ≤ H2 ≤ 0.25mm. Optionally, H2 can be set to 0.05mm, 0.1mm, or 0.25mm, etc. The specific setting should be selected according to the usage environment of the device, so as to improve the applicability and scope of application of the sealing groove 31.

[0036] In one embodiment, a welded structure is provided between the explosion-proof disc 30 and the first cover 21, and a welded structure is provided circumferentially on the outer and / or inner periphery of the second sealing element 40. The welded structure is used to seal the gap between the explosion-proof disc 30 and the first cover 21. This achieves a double seal between the second cover 22 and the explosion-proof disc 30. The welded seal design provides two sealing barriers, ensuring that even if the second sealing element 40 fails, the welded seal continues to function, preventing leakage. Furthermore, due to the tightness of the welded connection and the excellent performance of the sealing material, the welded seal can achieve zero leakage, making it particularly suitable for applications with extremely high sealing requirements. Moreover, the welded connection, achieved by melting the metal surface and forming a solid connection, possesses high strength and can withstand significant pressure and tension. The welded seal structure exhibits good durability and fatigue resistance, maintaining a stable sealing effect during prolonged use.

[0037] In this application, the welded structure may include multiple segmented weld lines or a single integrated weld line. Segmented weld lines, by dividing the weld into multiple segments for welding, can significantly reduce deformation during the welding process. This is because the welding heat and stress are relatively concentrated in each segment, and heat dissipation can be achieved promptly after welding, avoiding heat accumulation and deformation caused by prolonged continuous welding. Segmented weld lines make the welding conditions of each weld segment more consistent, which is beneficial for controlling welding speed and temperature, thereby improving weld quality. In addition, segmented welding can also reduce defects in the weld, such as cracks and slag inclusions. Segmented weld lines allow welders to flexibly arrange the welding sequence according to the length and position of the weld. This makes the welding process more efficient, reducing unnecessary waiting and repetitive work. Through segmented welding, the welding time of each weld segment can be more compact, thereby reducing the total welding time.

[0038] Integrated welding lines, through their integrated design and automated operation, enable efficient and continuous welding of the first cover 21 and the explosion-proof sheet 30. Compared to segmented welding, integrated welding lines significantly improve production efficiency and shorten production cycles. This is particularly important for mass production. Integrated welding lines typically employ high-precision welding equipment and control systems, ensuring the stability and reliability of the welding process. This helps reduce welding defects and improve the quality and strength of the weld. Simultaneously, integrated welding lines allow for precise control of welding parameters, meeting the needs of different materials and welding processes. Furthermore, integrated welding lines reduce heat loss and material waste during the welding process.

[0039] In one embodiment, the second seal 40 includes a sealing ring. As a key sealing element, the sealing ring plays a crucial role in various mechanical equipment and systems. The sealing ring provides a reliable seal, preventing media leakage. Its material selection and structural design enable it to maintain stable sealing performance under various pressure, temperature, and media conditions. Furthermore, sealing rings typically possess good elasticity and extensibility, allowing them to adapt to interfaces of different sizes and shapes, as well as minor deformations caused by pressure changes. This adaptability enables the sealing ring to maintain effective sealing under various complex and changing operating conditions.

[0040] Furthermore, the sealing ring material typically possesses excellent chemical corrosion resistance, enabling it to withstand the erosion of various corrosive media such as acids, alkalis, and salts. This ensures the long-term stable operation of the device. Simultaneously, the sealing ring usually exhibits high wear resistance and anti-aging properties, maintaining stable performance during extended use. This characteristic extends the service life of the cap assembly, reducing the frequency of maintenance and replacement. Moreover, the sealing ring's structure is generally relatively simple, facilitating installation and disassembly. This allows for convenient replacement or adjustment of the sealing ring during cap assembly maintenance, thereby ensuring the normal operation of the cap assembly.

[0041] In one embodiment, the first seal has a edging structure on the side away from the top cover. The edging structure is used to electrically insulate the perforated plate of the cap assembly from external components. This prevents the perforated plate from contacting the channel, thereby ensuring the stability of the battery during operation. At the same time, the edging structure has openings, which allow gas inside the battery to enter the cap assembly. When the gas pressure is too high, the explosion-proof sheet 30 can relieve the pressure.

[0042] Secondly, embodiments of the present invention provide a battery, which includes the aforementioned cap assembly.

[0043] In one embodiment, the second cover 22 is provided to protrude toward the side away from the receiving portion 15.

[0044] By applying the technical solution of this utility model, a cover body is connected to the receiving part 15, and the explosion-proof piece 30 is connected to the end face of the first cover body 21 away from the second cover body 22. This allows the edge of the top cover 20 to be free of edging structure, and there is a gap between the explosion-proof piece 30 and the receiving part 15, with the diameter of the explosion-proof piece 30 being smaller than the inner diameter of the receiving part 15. This allows the explosion-proof piece 30 to not contact the receiving part 15, and the receiving part 15 to not receive the explosion-proof piece 30. This allows the receiving part 15 to only receive the first cover body 21, thereby effectively reducing the shoulder height of the cap assembly, thus reducing the space occupied in the height direction of the battery, preventing compression of the electrode plates, and thus reducing the risk of damage to the electrode plate structure, which is beneficial to improving the capacity of the battery cell.

[0045] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0046] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0047] In the description of this utility model, it should be understood that the directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description. Unless otherwise stated, these directional terms 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, and therefore should not be construed as a limitation on the scope of protection of this utility model. The directional terms "inner" and "outer" refer to the inner and outer contours of each component itself.

[0048] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0049] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this utility model.

[0050] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A cap assembly, characterized in that, The cap assembly includes: The first sealing element has a receiving part; A top cover is disposed within the first sealing element. The top cover has a first cover body and a second cover body connected sequentially from bottom to top along the radial direction of the top cover. The end face portion of the first cover body away from the second cover body is connected to the receiving portion. An explosion-proof sheet is disposed inside the first sealing element. The explosion-proof sheet is connected to the end face of the first cover away from the second cover. There is a gap between the explosion-proof sheet and the receiving part, and the diameter of the explosion-proof sheet is smaller than the inner diameter of the receiving part.

2. The cap assembly according to claim 1, characterized in that, The first seal also includes: The body has a sealed chamber, and the top cover and the explosion-proof sheet are both disposed in the sealed chamber; A protruding structure is provided on the inner wall of the body along the circumference of the body, and the protruding structure forms the receiving part; One end of the main body can be bent toward one side of the protruding structure to form a receiving space together with the protruding structure. The periphery of the first cover is located within the receiving space, and the end face of the first cover away from the second cover is connected to the protruding structure.

3. The cap assembly according to claim 1, characterized in that, The height of the first cover is H1, where 0.3mm ≤ H1 ≤ 0.8mm.

4. The cap assembly according to any one of claims 1-3, characterized in that, The cap assembly further includes a second seal, which is disposed between the explosion-proof sheet and the first cover to seal the gap between the explosion-proof sheet and the first cover.

5. The cap assembly according to claim 4, characterized in that, The explosion-proof sheet and / or the first cover are provided with a sealing groove, and the second sealing element is disposed in the sealing groove.

6. The cap assembly according to claim 5, characterized in that, The sealing groove has a depth of H2 along the axial direction of the explosion-proof plate, where 0.05mm ≤ H2 ≤ 0.25mm.

7. The cap assembly according to claim 4, characterized in that, A welding structure is provided between the explosion-proof sheet and the first cover, and the welding structure is provided circumferentially on the outer and / or inner periphery of the second sealing member. The welding structure is used to seal the gap between the explosion-proof sheet and the first cover.

8. The cap assembly according to claim 4, characterized in that, The second seal includes a sealing ring.

9. The cap assembly according to claim 1, characterized in that, The second cover protrudes toward the side away from the receiving part.

10. The cap assembly according to any one of claims 1-9, characterized in that, The first sealing element has a edging structure on the side away from the top cover, the edging structure being used to electrically insulate the orifice plate of the cap assembly from external components.

11. A battery, characterized in that, The battery includes a cap assembly as described in any one of claims 1-10.

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