Battery cover plate and secondary battery
By setting a protrusion design on the end face of the battery cover sealing ring, the problem of the sealing ring folding when the battery's operating state changes is solved, achieving stable sealing under dynamic conditions and improving the battery's sealing performance and service life.
Patent Information
- Application Number
- CN202422888797.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-25
- Publication Date
- 2025-11-04
- Estimated Expiration
- 2034-11-25
AI Technical Summary
The sealing rings of existing battery covers are prone to folding when the battery's operating state changes, resulting in a decrease in sealing effect and difficulty in maintaining stable sealing performance under dynamic pressure and vibration.
Design a battery cover with a protrusion on the end face of the sealing ring. The protrusion is spaced apart from the edge of the end face of the sealing ring to ensure that the compression zone of the sealing ring is not located at the edge. The material flows to both sides during compression to form a tight fit.
It effectively prevents the sealing ring edge from folding over, improves sealing performance, extends the life of sealing material, and ensures good sealing effect under dynamic working conditions.
Smart Images
Figure CN223514087U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of battery technology, and in particular to a battery cover and a secondary battery. Background Technology
[0002] The rapid development of new energy technologies has placed higher demands on battery cell technology, especially improving the sealing performance of battery cells, which is crucial for the safety of battery cells.
[0003] In existing technologies, battery cover sealing typically employs a planar sealing ring. The edges of this planar sealing ring are susceptible to pressure during installation. As the battery pack's operating state changes, especially during charging and discharging, the battery's size and shape may undergo slight variations, increasing the pressure on the sealing ring's edges. Prolonged pressure can cause the sealing ring to fold, resulting in uneven sealing and a decreased sealing performance. Utility Model Content
[0004] In view of the shortcomings of the prior art described above, the purpose of this utility model is to provide a battery cover and a secondary battery, thereby improving the internal sealing of the battery.
[0005] To achieve the above and other related objectives, this utility model provides a battery cover, comprising:
[0006] The cover plate body has pole hole;
[0007] An electrode assembly includes an electrode body, which is inserted into an electrode hole, and the inner end of the electrode body is provided with a first flange.
[0008] A sealing ring is disposed between the cover plate body and the first flange, and the sealing ring abuts against the cover plate body and the first flange respectively;
[0009] The sealing ring has a protrusion on at least one end face, and the protrusion is spaced apart from the edge of the end face of the sealing ring.
[0010] In an optional embodiment of this utility model, the protrusion is disposed on the outer end face of the sealing ring.
[0011] In an optional embodiment of this utility model, the sealing ring includes:
[0012] The first region abuts the pole body in the radial direction;
[0013] The second region is located on the side of the first region away from the pole body;
[0014] The third region is located on the side of the second region away from the pole body. The third region includes a protrusion and a region body. The region body of the third region is the same width as the widest part of the protrusion.
[0015] The fourth region is located on the side of the third region away from the pole body.
[0016] In an optional embodiment of this utility model, the thickness of the first region is greater than the thickness of the second region, the first region is embedded in the pole hole, the thickness of the second region and the fourth region is equal to the distance between the cover plate body and the first flange, and / or the radial width of the fourth region is 0.3mm-1mm.
[0017] In an optional embodiment of this utility model, two electrode components are provided, one of which is a positive electrode component and the other is a negative electrode component; the outer end of the electrode body of the negative electrode component is made of a first conductive material, and the inner end of the electrode body of the negative electrode component is made of a second conductive material, and the projection of the protrusion in the thickness direction of the sealing ring avoids the joint between the first conductive material and the second conductive material.
[0018] In an optional embodiment of this utility model, the second region covers the seam between the first conductive material and the second conductive material.
[0019] In an optional embodiment of this utility model, the distance between the cover plate body and the first flange is 0.7 mm, and the thickness of the third region is 1.1-1.2 mm.
[0020] In an optional embodiment of the present invention, the edge of the inner end of the protrusion is closer to the pole assembly than the edge of the outer end of the protrusion, and the protrusion includes at least a slope facing the pole assembly.
[0021] In an optional embodiment of this utility model, the angle between the inclined surface and the outer end face of the sealing ring is 95°-120°.
[0022] This utility model also provides a secondary battery, including the battery cover plate, a battery cell and a casing, wherein the casing is connected to the battery cover plate to form a cavity for housing the battery cell, the battery cell is housed in the cavity, and the tabs of the battery cell are electrically connected to the terminal body.
[0023] The technical advantage of this invention lies in the fact that by setting a protrusion, the compression zone of the sealing ring is ensured not to be located at the edge of the sealing ring. Thus, during battery pack operation, the material located at the protrusion can flow freely to both sides during compression, thereby forming an effective seal. This design not only prevents the edge of the sealing ring from folding over but also significantly improves sealing performance. Attached Figure Description
[0024] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying 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.
[0025] Figure 1 This is a perspective view of the battery cover provided in an embodiment of the present invention;
[0026] Figure 2 This is a top view of the battery cover provided in an embodiment of the present invention;
[0027] Figure 3 yes Figure 2 AA section view;
[0028] Figure 4 yes Figure 3 A magnified view of part B;
[0029] Figure 5 This is a schematic diagram of the assembly of the sealing ring and the pole body provided in an embodiment of this utility model;
[0030] Figure 6 This is a perspective view of the sealing ring provided in an embodiment of this utility model;
[0031] Figure 7 This is a cross-sectional view of the sealing ring provided in an embodiment of this utility model.
[0032] Explanation of reference numerals in the attached drawings: 1. tab; 2. cell; 10. cover plate body; 20. sealing ring; 21. first region; 22. second region; 23. third region; 24. fourth region; 30. pole body; 31. first flange; 32. seam; 231. protrusion. Detailed Implementation
[0033] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model. It should be noted that, unless otherwise specified, the following embodiments and features described therein can be combined with each other.
[0034] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Therefore, the illustrations only show the components related to the present invention and are not drawn according to the number, shape and size of the components in actual implementation. In actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.
[0035] In the description of this utility model, the terms "inner" and "outer" are based on the cavity of the battery, that is, the side or end closer to the battery cavity is the inner side or inner end, and the side or end farther away from the battery cavity is the outer side or outer end.
[0036] A secondary battery, also known as a rechargeable battery or energy storage battery, is a battery that can be charged by an external electrical source and release electrical energy when needed. A secondary battery includes a casing, a battery cell 2, and a cover plate. The battery cell 2 is housed inside the casing, and the cover plate is connected to the casing to enclose the battery cell 2 inside the casing. The cover plate is generally provided with terminals. The inner end of the terminal is connected to the tab 1 of the battery cell 2, and the outer end of the terminal is exposed outside the cover plate for connecting to a busbar.
[0037] In existing battery technology, battery cover sealing typically employs a planar sealing ring 20. While this planar design is relatively simple to manufacture, its use is accompanied by a series of problems.
[0038] First, the edge of the planar sealing ring 20 is easily compressed during installation. As the battery pack's operating state changes, especially during charging and discharging, the size and shape of the battery may undergo slight changes, increasing the pressure on the edge of the sealing ring 20. Prolonged compression may cause the sealing ring 20 to fold, resulting in unevenness of the sealing surface and consequently a decrease in sealing effectiveness.
[0039] Secondly, the planar structure of the sealing ring 20 makes it difficult to maintain stable sealing performance under dynamic pressure and vibration. During battery use, heat is generated, and these heat changes cause the material to expand or contract, accelerating the fatigue and aging of the sealing ring 20 and further affecting its sealing function.
[0040] Furthermore, the traditional planar sealing ring 20 lacks effective stress distribution during contact with the battery plate, making it prone to localized sealing failure. This limitation renders existing sealing technologies significantly inadequate in preventing leakage, improving safety, and extending battery life.
[0041] like Figure 1-7 As shown, the technical solution of this utility model will be described in detail below with reference to specific embodiments:
[0042] like Figure 3 , 4 As shown, the battery cover provided in the embodiment of this utility model includes a cover body 10, a terminal assembly, and a sealing ring 20. The battery cover is used to cooperate with the housing to form a cavity for accommodating the battery cell 2. The terminal assembly is electrically connected to the tabs 1 of the battery cell 2 and is used to guide the input and output terminals of the battery cell 2 to the outside of the housing.
[0043] The cover plate body 10 has pole hole; in a specific embodiment, the cover plate body 10 can be made of metal material, such as a plain aluminum plate.
[0044] The electrode assembly includes an electrode body 30, which is inserted into the electrode hole, and the inner end of the electrode body 30 is provided with a first flange 31.
[0045] A sealing ring 20 is disposed between the cover plate body 10 and the first flange 31, and the sealing ring 20 abuts against both the cover plate body 10 and the first flange 31. The sealing ring 20 serves to insulate the pole body 30 and the cover plate body 10. The sealing ring 20 can be made of rubber.
[0046] The sealing ring 20 has a protrusion 231 on at least one end face, and the protrusion 231 is spaced apart from the edge of the end face of the sealing ring 20. The protrusion 231 is arranged around the periphery of the pole body 30.
[0047] In the above design, a protrusion 231 is provided on one end face of the sealing ring 20, which can effectively fill the gap between the cover plate body 10 and the first flange 31 during compression. With this design, when the sealing ring 20 is under pressure, the protrusion 231 flows to both sides, ensuring a tighter fit between the sealing material and the contact surface, significantly reducing the risk of electrolyte leakage. Because the protrusion 231 design prevents the compression zone of the sealing ring 20 from being located at the edge, this effectively avoids the problem of edge folding. This ensures that the sealing ring 20 maintains a good sealing effect under dynamic working conditions, extending the service life of the sealing material.
[0048] like Figure 3 , 4As shown, the protrusion 231 is disposed on the outer end face of the sealing ring 20. When placing the sealing ring 20, it is typically placed from top to bottom, with the lower surface of the sealing ring 20 serving as the support surface, which is also the inner end face. This ensures that the support surface is flat. A flat support surface provides more stable and uniform support. By designing the support surface of the sealing ring 20 as flat, the installation process is simplified, ensuring that the sealing ring 20 can be easily and accurately placed in position during assembly. This convenience reduces human error and unnecessary trouble in production. The flat support surface allows for better planar contact with the cover plate body 10 or other structures, thereby ensuring a higher degree of fit between the sealing ring 20 and other components, and ensuring consistent sealing performance.
[0049] like Figure 4 , 7 As shown, the sealing ring 20 includes a first region 21, a second region 22, a third region 23, and a fourth region 24. The first region 21, the second region 22, the third region 23, and the fourth region 24 are a whole, and are only a division of a whole.
[0050] The first region 21 abuts against the electrode body 30 in the radial direction; radial refers to the radial direction of the electrode body 30, that is, the direction perpendicular to the height of the electrode body 30. The first region 21 directly abuts against the electrode body 30, ensuring a tight connection between the sealing ring 20 and the electrode, and effectively preventing electrolyte leakage.
[0051] The second region 22 is located on the side of the first region 21 away from the pole body 30.
[0052] The third region 23 is located on the side of the second region 22 away from the pole body 30. The third region 23 includes a protrusion 231 and a region body. The region body of the third region 23 is the same width as the widest part of the protrusion 231. In addition to the region body, the third region 23 also includes the protrusion 231. The design of the protrusion 231 allows the sealing material to expand outward under pressure, effectively filling the tiny gaps on the contact surface, thereby enhancing the sealing performance.
[0053] The fourth region 24 is located on the side of the third region 23 away from the pole body 30.
[0054] By dividing the sealing ring 20 into these four areas, the design of each area can be optimized for different working conditions and pressure conditions, thereby improving the overall sealing effect.
[0055] like Figure 4 , 7As shown, the thickness of the first region 21 is greater than the thickness of the second region 22, and the first region 21 is embedded within the electrode post hole. The thicker first region 21 can be deeply embedded within the electrode post hole, forming a tighter contact surface. This tightness can effectively prevent electrolyte leakage, thereby improving the overall sealing effect.
[0056] The thickness of the second region 22 and the fourth region 24 is equal to the distance between the cover plate body 10 and the first flange 31. Due to process limitations and sealing reliability requirements, the cavity thickness between the first flange 31 and the cover plate body 10 is approximately 0.7 mm; therefore, the thickness of the second region 22 and the fourth region 24 is 0.7 mm. The second region 22 and the fourth region 24 are non-compression areas to avoid excessive compression range of the sealing ring 20, which would cause excessive rebound force of the sealing ring 20.
[0057] In an optional embodiment of this invention, the radial width of the fourth region 24 is 0.3mm-1mm. This ensures that after the compression zone of the protrusion 231 is compressed, excess material moves horizontally outward, the sealing ring 20 does not fold, and the cavity area is filled to complete the seal. By controlling the radial width, material failure or tearing due to local stress concentration can be avoided.
[0058] like Figure 3 , 4 As shown, there are two electrode assemblies, one of which is a positive electrode assembly and the other is a negative electrode assembly. The outer end of the electrode body 30 of the negative electrode assembly is made of a first conductive material, and the inner end of the electrode body 30 of the negative electrode assembly is made of a second conductive material. It should be understood that the materials of the positive and negative tabs 1 of the battery cell 2 are generally not the same. For example, the positive tab 1 is generally aluminum, and the negative tab 1 is generally copper. However, copper and aluminum cannot be welded together. Therefore, the inner end of the negative electrode assembly needs to be made of the same material as the negative tab 1, for example, a layer of copper material can be provided on the inner end of the negative electrode assembly.
[0059] The projection of the protrusion 231 in the thickness direction of the sealing ring 20 avoids the joint 32 between the first conductive material and the second conductive material. Since the protrusion 231 is the stress-bearing area under compression, this avoids stress being borne by the joint 32 area between the first and second conductive materials. This effectively disperses pressure and reduces the stress on the joint 32 area. This can reduce the fatigue risk in the joint 32 area and improve the reliability of the overall structure.
[0060] like Figure 3 , 4As shown, the second region 22 covers the seam 32 between the first and second conductive materials. This ensures that after the sealing ring 20 is compressed, electrolyte cannot flow into the seam 32 between the first and second conductive materials. The seam 32 between the first and second conductive materials refers to their composite interface. When two different conductive materials (such as aluminum and copper) come into contact with electrolyte, a galvanic cell phenomenon will form, leading to electrochemical corrosion. The design of covering the seam 32 can prevent direct contact between the electrolyte and the seam 32, reducing the risk of corrosion and thus extending the service life of the material.
[0061] In an optional embodiment of this utility model, the distance between the cover plate body 10 and the first flange 31 is 0.7 mm, and the thickness of the third region 23 is 1.1-1.2 mm. The thickness of the third region 23 refers to the thickness including the protrusion 231. The appropriate spacing combined with the thickness design of the third region 23 helps ensure that, under compression, the sealing ring 20 can fully fill the gap, effectively preventing liquid leakage and the entry of external contaminants, thereby improving the system's sealing performance.
[0062] like Figure 7 As shown, the inner edge of the protrusion 231 is closer to the pole post assembly than the outer edge of the protrusion 231, and the protrusion includes at least a slope facing the pole post assembly. Specifically, the cross-section of the protrusion 231 is trapezoidal, and further, the cross-section of the protrusion 231 is an isosceles trapezoid, with the outer width of the protrusion 231 being smaller than the inner width. The slope corresponds to the hypotenuse of the isosceles trapezoid. The isosceles trapezoid design allows the sealing ring 20 to better fit the sealing surface during compression, and the material flows evenly to both sides during compression, thereby improving sealing performance and preventing leakage.
[0063] The angle between the inclined surface and the outer end face of the sealing ring 20 is 95°-120°. That is, the angle between the hypotenuse of the isosceles trapezoid and the upper or lower base is 95°-120°. The angle design of the hypotenuse can effectively disperse the pressure applied to the sealing ring 20, guide the vertical compressive force to both sides through the hypotenuse so that the material flows evenly to both sides during compression, and avoid excessive stress concentration at a certain point, thereby reducing the risk of material failure.
[0064] This utility model also provides a secondary battery, including the battery cover plate, the battery cell 2 and the outer casing. The outer casing is connected to the battery cover plate to form a cavity for housing the battery cell 2. The battery cell 2 is housed in the cavity, and the tab 1 of the battery cell 2 is electrically connected to the terminal body 30.
[0065] In summary, this invention ensures that the compression zone of the sealing ring 20 is not located at the edge of the sealing ring 20 by setting the protrusion 231. Thus, during battery pack operation, the material located at the protrusion 231 can flow freely to both sides during compression, thereby forming an effective seal. This design not only prevents the edge of the sealing ring 20 from folding but also significantly improves sealing performance. The position of the protrusion 231 avoids stress on the joint 32 area between the first and second conductive materials. This effectively disperses pressure and reduces stress on the joint 32 area. This reduces the fatigue risk in the joint 32 area and improves the overall structural reliability. The position of the second area 22 prevents electrolyte from flowing into the joint 32 between the first and second conductive materials.
[0066] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.
[0067] Throughout this description, numerous specific details, such as examples of components and / or methods, are provided to provide a complete understanding of embodiments of the present invention. However, those skilled in the art will recognize that embodiments of the present invention may be practiced without one or more of these specific details or by other devices, systems, components, methods, parts, materials, components, etc. In other instances, well-known structures, materials, or operations have not been specifically shown or described in detail to avoid obscuring aspects of embodiments of the present invention.
[0068] Throughout this specification, references to "an embodiment," "an embodiment," or "a specific embodiment" mean that a particular feature, structure, or characteristic described in connection with an embodiment is included in at least one embodiment of the present invention, but not necessarily in all embodiments. Therefore, the various representations of the phrases "in one embodiment," "in an embodiment," or "in a specific embodiment" in different places throughout the specification do not necessarily refer to the same embodiment. Furthermore, a particular feature, structure, or characteristic of any specific embodiment of the present invention can be combined with one or more other embodiments in any suitable manner. It should be understood that other variations and modifications of the embodiments of the present invention described and illustrated herein may be based on the teachings herein and will be considered part of the spirit and scope of the present invention.
[0069] It should also be understood that one or more of the elements shown in the figures may be implemented in a more separate or more integrated manner, or may even be removed because they are inoperable in certain circumstances or provided because they may be useful for a particular application.
[0070] Furthermore, unless otherwise expressly stated, any arrows in the accompanying drawings should be considered illustrative only and not limiting. Additionally, unless otherwise stated, the term "or" as used herein is generally intended to mean "and / or". Where a term is anticipated to provide a separation or combination capability that is unclear, a combination of components or steps will also be considered as indicated.
[0071] As used herein and throughout the claims below, unless otherwise specified, “a” and “the” include the plural references. Similarly, as used herein and throughout the claims below, unless otherwise specified, “in” means “in” and “on”.
[0072] The above description of the embodiments shown in this utility model (including the content set forth in the abstract of the specification) is not intended to be an exhaustive enumeration or to limit the utility model to the precise forms disclosed herein. Although specific embodiments and examples of the utility model have been described herein for illustrative purposes only, various equivalent modifications are possible within the spirit and scope of the utility model, as will be recognized and understood by those skilled in the art. As indicated, these modifications can be made to the utility model in accordance with the above description of the embodiments described herein, and such modifications will be within the spirit and scope of the utility model.
[0073] This document has generally described the systems and methods in detail to aid in understanding the present invention. Furthermore, various specific details have been set forth to provide a general understanding of embodiments of the present invention. However, those skilled in the art will recognize that embodiments of the present invention can be practiced without one or more specific details, or using other devices, systems, accessories, methods, components, materials, parts, etc. In other instances, well-known structures, materials, and / or operations have not been specifically shown or described in detail to avoid obscuring aspects of embodiments of the present invention.
[0074] Therefore, although the present invention has been described herein with reference to specific embodiments thereof, freedom of modification, various changes and substitutions are also within the scope of the above disclosure, and it should be understood that in some cases, certain features of the present invention may be adopted without departing from the scope and spirit of the invention and without corresponding use of other features. Thus, many modifications can be made to adapt a particular environment or material to the essential scope and spirit of the present invention. The present invention is not intended to be limited to the specific terms used in the following claims and / or the specific embodiments disclosed as the best mode of carrying out the present invention, but the present invention will include any and all embodiments and equivalents falling within the scope of the appended claims. Therefore, the scope of the present invention will be determined only by the appended claims.
Claims
1. A battery cover, characterized in that, include: The cover plate body has pole hole; An electrode assembly includes an electrode body, which is inserted into an electrode hole, and the inner end of the electrode body is provided with a first flange. A sealing ring is disposed between the cover plate body and the first flange, and the sealing ring abuts against the cover plate body and the first flange respectively; The sealing ring has a protrusion on at least one end face, and the protrusion is spaced apart from the edge of the end face of the sealing ring.
2. The battery cover according to claim 1, characterized in that, The protrusion is located on the outer end face of the sealing ring.
3. The battery cover according to claim 2, characterized in that, The sealing ring includes: The first region abuts the pole body in the radial direction; The second region is located on the side of the first region away from the pole body; The third region is located on the side of the second region away from the pole body. The third region includes a protrusion and a region body. The region body of the third region is the same width as the widest part of the protrusion. The fourth region is located on the side of the third region away from the pole body.
4. The battery cover according to claim 3, characterized in that, The thickness of the first region is greater than the thickness of the second region. The first region is embedded in the pole hole. The thickness of the second region and the fourth region is equal to the distance between the cover plate body and the first flange, and / or the radial width of the fourth region is 0.3mm-1mm.
5. The battery cover according to claim 3, characterized in that, The electrode assembly has two parts, one of which is a positive electrode assembly and the other is a negative electrode assembly; the outer end of the electrode body of the negative electrode assembly is made of a first conductive material, and the inner end of the electrode body of the negative electrode assembly is made of a second conductive material; the projection of the protrusion in the thickness direction of the sealing ring avoids the joint between the first conductive material and the second conductive material.
6. The battery cover according to claim 5, characterized in that, The second region covers the seam between the first conductive material and the second conductive material.
7. The battery cover according to claim 3, characterized in that, The distance between the cover plate body and the first flange is 0.7 mm, and the thickness of the third region is 1.1-1.2 mm.
8. The battery cover according to claim 2, characterized in that, The inner edge of the protrusion is closer to the pole assembly than the outer edge of the protrusion, and the protrusion includes at least a slope facing the pole assembly.
9. The battery cover according to claim 8, characterized in that, The angle between the inclined surface and the outer end face of the sealing ring is 95°-120°.
10. A secondary battery, characterized in that, The battery includes a battery cover as described in any one of claims 1-9, a battery cell, and a housing, wherein the housing is connected to the battery cover to form a cavity for housing the battery cell, the battery cell is housed within the cavity, and the tabs of the battery cell are electrically connected to the terminal body.