Battery cover plate and secondary battery

Abstract

The utility model relates to the technical field of batteries, and provides a battery cover plate and a secondary battery, which comprise a cover plate body, a pole component and an insulating ring. The cover plate body is provided with a pole hole; the pole assembly comprises a pole body and a riveting block, and the pole body is inserted into the pole hole; the insulating ring is arranged between the pole assembly and the cover plate body to form insulation; the riveting block is riveted with the pole body in the thickness direction of the pole body, an extension part is arranged on one side, far away from the pole body, of the riveting block, the extension part is riveted with the cover plate body in the thickness direction of the pole body, and the inner end of the riveting block is inserted into the pole hole. The riveting block is inserted into the pole hole in a sinking manner, so that the riveting block and the cover plate body can share a part of height space, and the overall height of the pole is effectively reduced. Through the design, the space utilization rate of the battery is improved, and the volume energy density of the battery is further improved. Not only is the performance of the battery improved, but also the design requirements of lighter, thinner and more compact products can be met.

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 space utilization rate of battery cells, which is crucial for increasing the energy density of battery cells.

[0003] In existing technologies, the riveting structure on the terminal post is usually located on the outside of the battery cover. This requires the terminal post to protrude significantly on the outside to accommodate the riveting structure, resulting in a higher overall height and affecting the cell's energy density. Cell energy density directly affects battery performance and the compactness of the overall design. 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 that can reduce the height of the electrode post, thereby increasing the energy density 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] A pole assembly, the pole assembly including a pole body and a riveting block, the pole body being inserted into the pole hole;

[0008] An insulating ring is disposed between the pole assembly and the cover plate body to form insulation;

[0009] The riveting block is riveted to the pole body in the thickness direction of the pole body. An extension is provided on the side of the riveting block away from the pole body. The extension is riveted to the cover plate body in the thickness direction of the pole body. The inner end of the riveting block is inserted into the pole hole.

[0010] In an optional embodiment of this utility model, the riveting block is provided with a stepped hole for the pole body to be inserted for riveting, and the outer diameter of the stepped hole is larger than the inner diameter.

[0011] In an optional embodiment of the present invention, the extension is disposed at the outer end of the riveting block and extends radially along the pole hole, and the edge of the extension extends beyond the outer periphery of the pole hole.

[0012] In an optional embodiment of this utility model, the outer end face of the pole body is disposed close to the outer side relative to the outer end face of the rivet block, and the outer end face of the pole body constitutes a welding surface for welding the busbar.

[0013] In an optional embodiment of this utility model, the area of ​​the outer end face of the riveting block is smaller than the area of ​​the outer end face of the pole body.

[0014] In an optional embodiment of this utility model, the outer end face of the riveting block is disposed close to the outer end face of the pole body, and the outer end face of the riveting block constitutes a welding surface for welding the busbar.

[0015] In an optional embodiment of this utility model, the area of ​​the outer end face of the riveting block is larger than the area of ​​the outer end face of the pole body.

[0016] In an optional embodiment of this utility model, the distance between the outer end face of the riveting block and the outer end face of the pole body is at least 0.2 mm.

[0017] In an optional embodiment of this utility model, the inner end face of the riveting block is flush with the inner end face of the cover plate body.

[0018] 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.

[0019] The technical advantage of this invention lies in the fact that by inserting the rivet block into the terminal hole, the rivet block can share a portion of the height space with the cover plate body, thereby effectively reducing the overall height of the terminal. This design improves the space utilization of the battery, thus increasing the volumetric energy density of the battery. This optimization not only helps improve battery performance but also meets the requirements for thinner and more compact product designs. Attached Figure Description

[0020] 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.

[0021] Figure 1 This is a top view of the battery cover provided in an embodiment of the present invention;

[0022] Figure 2 This is one embodiment of the present invention. Figure 1 AA section view;

[0023] Figure 3 yes Figure 2 Dimensional diagram;

[0024] Figure 4 This is a cross-sectional view of the battery cover in another embodiment of the present invention;

[0025] Figure 5 yes Figure 4 Dimensional diagram;

[0026] Figure 6 This is a perspective view of the riveting block provided in an embodiment of this utility model;

[0027] Figure 7 This is a cross-sectional view of the riveting block provided in an embodiment of this utility model.

[0028] Explanation of reference numerals in the attached drawings: 10, cover plate body; 20, pole body; 30, riveting block; 31, inner section; 32, outer section; 33, stepped surface; 34, extension; 40, insulating ring. Detailed Implementation

[0029] 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.

[0030] 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.

[0031] 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.

[0032] 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 consists of a casing, battery cells, and a cover. The battery cells are housed inside the casing, and the cover is connected to the casing to enclose the battery cells within the casing. The cover typically has terminals, the inner end of which connects to the tabs of the battery cells, while the outer end of the terminals protrudes from the cover and is used to connect to a busbar.

[0033] In existing technologies, the outer ends of the terminals often employ metal riveting structures, such as aluminum riveting structures. These riveting structures are located on the outside of the battery cover to ensure the connection strength and reliability of the terminals. However, this design, which emphasizes connection stability, introduces a significant drawback: to meet the installation requirements of the riveting structure, the terminals often need to protrude relatively high to the outside. This not only increases the overall height of the battery but also negatively impacts the energy density of the cell. Cell energy density refers to the electrical energy stored per unit volume or mass of battery; this parameter directly relates to battery performance, range, and the compactness of the overall design.

[0034] Therefore, reducing the overall height and increasing the cell energy density while ensuring the reliability of the terminal connection structure has become a key technical challenge in current rechargeable battery design. Optimizing the terminal design can not only reduce the size and weight of the battery, but also promote the increase of cell energy density, thereby improving the overall performance and market competitiveness of the battery. Against this backdrop, new design solutions are urgently needed to meet the growing demand for high-performance, high-density batteries in future electric vehicles and energy storage systems.

[0035] like Figure 1-7 As shown, the technical solution of this utility model will be described in detail below with reference to specific embodiments:

[0036] like Figure 1-5 As shown, this utility model provides a battery cover, including a cover body 10, a terminal assembly, and an insulating ring 40. The battery cover is used to cooperate with a housing (not shown) to form a cavity for housing a battery cell. The terminal assembly is electrically connected to the tabs of the battery cell and is used to guide the input and output terminals of the battery cell to the outside of the housing.

[0037] The cover plate body 10 has pole hole, and the cover plate body 10 can be made of metal material, such as a plain aluminum plate.

[0038] A pole assembly, the pole assembly including a pole body 20 and a riveting block 30, wherein the pole body 20 is inserted into the pole hole;

[0039] An insulating ring 40 is disposed between the terminal assembly and the cover plate body 10 to form insulation. The insulating ring 40 may be made of, for example, plastic. The insulating ring 40 between the terminal assembly and the cover plate body 10 effectively isolates current and prevents safety hazards such as short circuits. This design ensures the safety of the battery during operation and improves the reliability of the overall battery system.

[0040] The riveting block 30 is riveted to the electrode body 20 in the thickness direction of the electrode body 20. An extension 34 is provided on the side of the riveting block 30 away from the electrode body 20. The extension 34 is riveted to the cover plate body 10 in the thickness direction of the electrode body 20. The inner end of the riveting block 30 is inserted into the electrode hole. The riveting block 30 is made of a conductive material, such as aluminum. By recessing the riveting block 30 into the electrode hole and utilizing part of the height space of the cover plate, the overall height of the electrode is effectively reduced. This design not only helps improve the compactness of the battery but also saves space in the structural design and improves the flexibility of the overall layout. The thickness direction of the electrode body 20 is the height direction of the battery, which is... Figure 1 The height direction in the middle.

[0041] like Figure 6 , 7 As shown, the riveting block 30 is provided with a stepped hole for the insertion and riveting of the pole body 20. The diameter of the outer section 32 of the stepped hole is larger than the diameter of the inner section 31. The pole body 20 is a stepped shaft structure that conforms to the shape of the stepped hole. The structural design of the stepped hole forms a stepped surface 33 between the outer section 32 and the inner section 31. The stepped surface 33 can effectively withstand the riveting force between the pole body 20 and the riveting block 30 in the thickness direction of the pole body 20.

[0042] like Figure 2-5 As shown, the extension 34 is disposed at the outer end of the riveting block 30 and extends radially along the terminal hole, with the edge of the extension 34 extending beyond the outer periphery of the terminal hole. The extension 34 extending beyond the outer periphery of the terminal hole means that the projected contour of the extension 34 in the thickness direction can cover the terminal hole (excluding overlap). That is, the extension 34 can compress the area of ​​the cover plate body 10 circumferentially around the terminal hole in the thickness direction of the terminal body 20. This allows the extension 34 to compress the area of ​​the cover plate body 10 outwards, similar to a riveting effect. Through this compression, the extension 34 firmly fixes the terminal body 20 to the cover plate body 10, enhancing the connection's strength. This design ensures that the connection between the cover plate body 10 and the terminal is not easily loosened, especially under vibration and impact during battery operation, maintaining a stable structure.

[0043] Example 1, as Figure 2 , 3As shown, the outer end face of the terminal body 20 is positioned closer to the outer side than the outer end face of the riveting block 30. The outer end face of the terminal body 20 forms a welding surface for welding the busbar, which is the current bus. By positioning the outer end face of the terminal body 20 further outward, ensuring that only the terminal body 20 is connected to the current busbar, it is possible to effectively prevent the force on the current busbar from being simultaneously transmitted to the riveting block 30. This design reduces the impact of external forces on the riveting area, thereby reducing the risk of connection failure and ensuring the reliability of the battery system.

[0044] like Figure 3 As shown, the area of ​​the outer end face of the riveting block 30 is smaller than the area of ​​the outer end face of the pole body 20. Specifically, the inner section 31 of the stepped hole has a radial thickness L1 of at least 1 mm, the inner section 31 of the stepped hole has a height H1 in the thickness direction of the pole body 20 of 1-2 mm, the outer section 32 of the stepped hole has a height H2 in the thickness direction of the pole body 20 of at least 1 mm, the step surface 33 between the inner section 31 and the outer section 32 has a radial width L3 of 0.2-0.5 mm, and the extension length L4 of the extension portion 34 is 2-5 mm. This dimensional setting is to ensure that the outer end face of the pole body 20 has a large area to facilitate welding of the busbar. Because the outer end face of the pole body 20 has a large area, it can provide a better welding contact surface, ensuring the firmness and reliability of welding, and improving the strength of the overall structure.

[0045] Example 2, as Figure 4 , 5 As shown, the outer end face of the riveting block 30 is positioned closer to the outer end face of the pole body 20, and the outer end face of the riveting block 30 constitutes a welding surface for welding the busbar. The non-flush outer end faces of the pole body 20 and the riveting block 30 ensure that only the riveting block 30 is connected to the busbar, preventing the force on the busbar from being simultaneously transmitted to both the pole body 20 and the riveting block 30, thus avoiding riveting failure between the two.

[0046] like Figure 5As shown, the area of ​​the outer end face of the riveting block 30 is larger than the area of ​​the outer end face of the pole body 20. Specifically, the radial thickness L1' of the inner section 31 of the stepped hole is at least 3 mm, the height H1' of the inner section 31 of the stepped hole in the thickness direction of the pole body 20 is 1-1.8 mm, the radial thickness L2' of the outer section 32 of the stepped hole is at least 3 mm, the height H2' of the outer section 32 of the stepped hole in the thickness direction of the pole body 20 is at least 1 mm, the radial width L3' of the stepped surface 33 between the inner section 31 and the outer section 32 is 0.2-0.5 mm, the extension length L4' of the extension 34 is 5-10 mm, and the height H4' of the extension 34 in the thickness direction of the pole body 20 is at least 1 mm. This dimensional setting is to ensure that the outer end face of the riveting block 30 has a large area to facilitate welding of the busbar. The larger outer end face of the rivet block 30 provides a better contact surface during welding, which helps to improve the strength and stability of the welded joint and reduce welding defects. The appropriate extension length and height settings allow the extension 34 to better mate with other components, improving assembly accuracy and efficiency.

[0047] like Figure 3 , 5 As shown, the distance H5 between the outer end face of the riveting block 30 and the outer end face of the pole body 20 is at least 0.2 mm. The reason for setting the distance between the outer end face of the riveting block 30 and the outer end face of the pole body 20 to at least 0.2 mm is primarily to balance the reliability of the connection with the overall height of the assembly. During the design process, if the distance between the riveting block 30 and the pole body 20 is too close, slight deformations caused by the connection of the busbar may be transmitted to adjacent components during actual use, leading to riveting failure and affecting the stability and safety of the assembly.

[0048] Conversely, if the spacing is too large, it may increase the overall height of the pole assembly, which is detrimental to the compactness of the equipment and the efficiency of installation space utilization. Therefore, setting a spacing of 0.2mm can effectively reduce potential structural problems while maintaining an appropriate height of the assembly and optimizing the overall design. This design concept not only improves product performance but also enhances the operability of the manufacturing and assembly process.

[0049] like Figure 2-5 As shown, the inner end face of the rivet block 30 is flush with the inner end face of the cover plate body 10. This ensures that the rivet block 30 shares a portion of the height space with the cover plate body 10 to the maximum extent, thereby reducing the height of the pole post assembly. It also ensures a reasonable fit between the rivet block 30 and the cover plate body 10, avoiding intrusion into the inner side of the cover plate body 10.

[0050] This utility model also provides a secondary battery, including the battery cover plate, a battery cell and a housing, wherein the housing 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 20.

[0051] In summary, the above solution, by inserting the rivet block 30 into the terminal hole, allows the rivet block 30 to share a portion of the height space with the cover plate body 10, thereby effectively reducing the overall height of the terminal. This design improves the space utilization of the battery, thereby increasing the volumetric energy density. This optimization not only helps improve battery performance but also meets the requirements for thinner and more compact product designs. Simultaneously, the extension 34 firmly fixes the terminal body 20 to the cover plate body 10, enhancing the connection's strength. This design ensures that the connection between the cover plate body 10 and the terminal is not easily loosened, especially under vibration and impact during battery operation, maintaining a stable structure. The non-flush outer end faces of the terminal body 20 and the rivet block 30 ensure that only one connects to the busbar, preventing the force on the busbar from being simultaneously transmitted to both the terminal body 20 and the rivet block 30, thus avoiding riveting failure between them.

[0052] 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.

[0053] 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.

[0054] 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.

[0055] 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.

[0056] 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.

[0057] 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”.

[0058] 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.

[0059] 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.

[0060] 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; A pole assembly, the pole assembly including a pole body and a riveting block, the pole body being inserted into the pole hole; An insulating ring is disposed between the pole assembly and the cover plate body to form insulation; The riveting block is riveted to the pole body in the thickness direction of the pole body. An extension is provided on the side of the riveting block away from the pole body. The extension is riveted to the cover plate body in the thickness direction of the pole body. The inner end of the riveting block is inserted into the pole hole.

2. The battery cover according to claim 1, characterized in that, The riveting block is provided with a stepped hole for the pole body to be inserted and riveted, and the outer diameter of the stepped hole is larger than the inner diameter.

3. The battery cover according to claim 2, characterized in that, The extension is disposed at the outer end of the rivet block and extends radially along the pole hole, with the edge of the extension extending beyond the outer periphery of the pole hole.

4. The battery cover according to claim 3, characterized in that, The outer end face of the pole body is positioned close to the outer side relative to the outer end face of the rivet block, and the outer end face of the pole body forms a welding surface for welding the busbar.

5. The battery cover according to claim 4, characterized in that, The area of ​​the outer end face of the rivet block is smaller than the area of ​​the outer end face of the pole body.

6. The battery cover according to claim 3, characterized in that, The outer end face of the rivet block is positioned close to the outer end face of the pole body, and the outer end face of the rivet block forms a welding surface for welding the busbar.

7. The battery cover according to claim 6, characterized in that, The area of ​​the outer end face of the rivet block is larger than the area of ​​the outer end face of the pole body.

8. The battery cover according to claim 4 or 6, characterized in that, The distance between the outer end face of the rivet block and the outer end face of the pole body is at least 0.2 mm.

9. The battery cover according to claim 1, characterized in that, The inner end face of the rivet block is flush with the inner end face of the cover plate body.

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.

Images